A high-pitched, blowing, systolic heart murmur under the left nipple likely indicates turbulent blood flow due to a heart valve condition. Further evaluation with tools like echocardiograms is necessary to diagnose the exact cause of the murmur, considering that heart murmurs are graded on their intensity and auscultation may be enhanced with deep breathing.
Explanation:The heart murmur described by the student is likely to be caused by turbulent blood flow due to a heart valve condition. This type of murmur, being high-pitched, blowing, and heard during the systolic phase of the heart cycle, could be indicative of a mitral valve prolapse, mitral regurgitation, or aortic stenosis. Without prior history of a murmur, a newly detected systolic murmur near the left nipple is of particular concern and warrants further investigation.
Heart murmurs are graded on their intensity from 1 to 6, and the location where the murmur is best heard can provide clues as to which valve may be affected. Moreover, when auscultating the heart, clinicians may request that the patient breathe deeply to enhance the sound of murmurs, which helps in their detection and characterization.
Diagnostic tools such as phonocardiograms, auscultograms, and ultrasounds, particularly echocardiograms, are useful in analyzing these abnormal heart sounds to determine their cause. Given this new finding of a heart murmur in a person with no known history of cardiac issues, a referral to a cardiologist for further evaluation would be prudent.
Przyjrzyj siê zdjêciom a nastêpnie zapisz zgodnie z przyk³adem w jakiej formie wystepuj¹ przedstawione na ich rosliny okrytonasienne
Answer:
Proszę podać zdjęcie wraz z pytaniem.
The process of making rna from dna is called
Answer: DNA transcription
Transcription is the process where RNA is created from DNA using RNA Polymerase. This creates an mRNA strand carrying genetic instructions which will be translated into a protein during translation.
Explanation:The process of creating RNA from DNA is known as transcription. This process involves an enzyme known as RNA Polymerase which unzips the DNA's double helix structure to use one strand as a template for building an mRNA molecule. The constructed mRNA molecule carries genetic instructions from the DNA and these instructions will subsequently be read by ribosomes in the protein synthesis process, also known as translation.
Transcription can be divided into three main stages: initiation, elongation, and termination. During initiation, the RNA Polymerase attaches to a specific area on the DNA strand. For elongation, the enzyme moves along the DNA template, synthesizing a new mRNA strand in a 5' to 3' direction. Once the RNA Polymerase encounters a termination signal on the DNA, transcription stops, and the mRNA molecule is released.
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Choose the word that best completes the statement about Stanzas 90 through 92 of Canto I in Don Juan.
Byron uses Wordsworth and Coleridge as objects of _____.
respect
ridicule
inspiration
Answer:
Option A ridicule
Explanation:
Byron made sure that he shall never neglect the inclusion of literary and cultural criticism in his comedic epic and thus he uses Wordsworth and Coleridge first object of respect sarcastically mentions that his own writings are very small as compared to the great accomplishments of these two writers and then in later lines he criticize their discursive and verbose styles of writing thereby demonstrating his own cursory STYLE
Hence, option B is correct
Byron uses Wordsworth and Coleridge as objects of ridicule.
In Stanzas 90 through 92 of Canto I in Don Juan, Byron uses Wordsworth and Coleridge as objects of ridicule. He satirizes their poetic style and themes, contrasting their idealized portrayals of nature with a more realistic and humorous perspective.
Byron pokes fun at the Romantic poets' tendency to indulge in lofty and sentimental themes, portraying them as disconnected from the realities of everyday life.
Byron uses Wordsworth and Coleridge as objects of ridicule in Stanzas 90 through 92 of Canto I in Don Juan, satirizing their poetic style and themes.
Where is the dinosaur national monument located
Nevada? I am not sure but I am thinking that is where it is. Hope that helps you!? Have a great day!
In socially stratified societies, the relative frequency of many diseases, health problems, and death rates varies directly with
answer:
social class
The answer is social class
What implications need to be considered when creating environmental policies?
1.How much will it cost?
2.How will it affect the environment?
3.How will it affect people?
4.Is the benefit worth the cost?
5.How will it reduce tourist activity?
Answer:
2 and 4
Explanation:
Answer:
From 1 to 3.
Explanation:
When dealing with environmental laws and other policies the policymakers need to make users how much will the cost be or need to take an estimate of the funds that are needed to make environmental policies. Then it's essential to estimate the environment in which it's going to affect and take into account the effect of these policies it will have on other environments. Whether it will be beneficial for the others taking into account the human factors like immigration and emigration etc. Environment laws have never been made without the due acceptance of the countries in treaty such as the UNEP is a program that aims for all the overall environmental protection and regulation of norms of planning.Which statement is true about rock changes over time?
Only rocks with a high degree of quartz in them can stop erosion.
Rock slides cause little damage.
All rocks can be subject to rock falls.
No rock is hard enough to resist the force of erosion.
Answer:
No rock is hard enough to resist the force of erosion.
Explanation:
Rocks like Granite, Diamonds, and just a pebble laying on the ground can be eroded over time. Even Mountains get eroded!
Answer:
C.
Explanation: promise
The Punnett square illustrates a cross for flower position in the pea plant. The phenotypes and genotypes of the parents have been given. The allele for axial position is dominant and represented by A. The allele for terminal flower position is recessive and represented by a. What is the genotype of the offspring? Heterozygous homozygous recessive homozygous dominant
Final answer:
The genotype of the offspring from a cross involving homozygous dominant (AA) and homozygous recessive (aa) parents will all be heterozygous (Aa) for the F1 generation with an axial flower position phenotype. In an F2 cross (Aa x Aa), the genotypic ratio will be 1 homozygous dominant (AA), 2 heterozygous (Aa), and 1 homozygous recessive (aa), with a phenotypic ratio of 3 axial to 1 terminal.
Explanation:
The gene for flower position in pea plants has two alleles: axial (A), which is dominant, and terminal (a), which is recessive. For a cross involving two parents that are homozygous for each trait (AA x aa), all F₁ offspring would be heterozygous (Aa) because each parent can only contribute one type of allele. Consequently, all F₁ plants would display the axial flower position phenotype since it is dominant.
For the F₂ generation, which involves crossing two F₁ heterozygous individuals (Aa x Aa), the Punnett square predicts that the offspring will have the following genotypes and phenotypes: 1 AA (homozygous dominant), 2 Aa (heterozygous), and 1 aa (homozygous recessive). The expected phenotypic ratio would be 3 axial: 1 terminal flowering positions, as the dominant A allele expresses the axial phenotype in both AA and Aa genotypes, while only the aa genotype will express the terminal flowering position.
What does the right side of the brain control
Answer:
The right side coordinate the left side of the body and helps in comparisons, rough calculations and has to do with art and creativity.
Explanation:
The brain is made up of two hemispheres which include right and left hemisphere. Thus, each of the hemispheres is connected together by bundles of nerve fibers. However, right hemisphere is commonly refers to as analog brain that coordinate the left side of the body. Furthermore, the right side of the brain helps in comparisons, rough calculations and has to do with art and creativity. Similarly, it is responsible for the control of reasoning, attention, problem solving and memory.
Which of these might be a positive effect of the increase in carbon dioxide levels? A. Rise in sea level B. Decrease in plant growth C. Increase in plant growth D. Increased melting of ice caps
Answer:
Explanation:
The answer should be B
Plants breath in CO2 and breath out oxygen. If there are fewer plants, there is going to be left over CO2.
Answer:
Its C
Explanation:
Plants use carbon dioxide for photosynthesis thus making plant growth increase
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PLEASE HELP!!!! I WILL GIVE BRAINIEST!!!! What is the difference between weathering and erosion? How are mechanical weathering and chemical weathering different? How are hydrolysis and oxidation similar? Explain the process of exfoliation. As waves crash into rock along the shoreline, particles of sand, shell, and other materials in the ocean water loosen tiny bits of sediment from the rock. As the waves recede, they carry the sediment away. In this scenario, which process represents weathering, and which process represents erosion?
Answer:
Explanation:
1. What is the difference between weathering and erosion?
ANSWER
Weathering is the physical disintegration and chemical decomposition of rocks to form soils and rocks. Weathering acts to break down earth materials.
while
Erosion is the wearing or washing away of weathered materials. Without weathering, there won't be erosion.
2. How are mechanical weathering and chemical weathering different?
Solution
Mechanical weathering is the physical disintegration of rocks. Examples are:
>Pressure release on rocks
>Biological activities
>Freezing and thawing
> Drying and wetting of rocks
Mechanical weathering helps to loosen rocks and to increase surface area of exposure of rocks.
while
Chemical weathering is the deacy and decompostion of rocks. Chemical reactions on rocks are initiated naturally in different forms. Bonds between rock molecules are broken, water can dissolve some soluble rock contents, etc, all this would lead to chemical weathering of such rocks. Chemical weathering occurs through:
>Hydrolysis
>Carbonation
>Oxidation etc.
4. How are hydrolysis and oxidation similar?
Hydrolysis and oxidation are both processes of chemical weathering. They aid in chemical decomposition of rocks.
Hydrolysis causes decompositon through the action of water. In oxidation, oxygen reacts with earth materials.
5. Explain the process of exfoliation.
Exfoliation is a physical weathering process. It accompanies pressure release on a rock surface.
Rocks overly one another and by so doing, they mount pressure on the underlying ones. The part of the bedrock close to overhead rock receives more pressure while the part far away receives little to no pressure. This differential pressure is what leads to exfoliation of rocks. Exfoliation is produced when the overlying rock is moved away and the pressure is released.
When a rock exfoliates, it breaks down into layers like an onion skin. It can create a massive feature known as an exfoliation dome. Each sheet is a product of pressure differences.
6. As waves crash into rock along the shoreline, particles of sand, shell, and other materials in the ocean water loosen tiny bits of sediment from the rock.
>>>>>>>>>This is weathering
As the waves recede, they carry the sediment away. In this scenario, which process represents weathering, and which process represents erosion?
>>>>>>>>> This is erosion
Answer:
1.Weathering is the breakdown of rock into smaller particles through mechanical or chemical means. Erosion is the process by which weathering products are carried away.
2.Mechanical weathering simply breaks rock into smaller fragments. Chemical weathering actually changes the mineral composition of rock.
3.Hydrolysis and oxidation are similar in that both involve chemical reactions between a mineral and another material. Hydrolysis is a chemical reaction between a mineral and water. Oxidation is a chemical reaction between a mineral and oxygen.
4.Exfoliation is the cracking of rock caused by a decrease in pressure. It occurs when a mass of rock is exposed by weathering and removal of the overlying rock, which decreases pressure on the rock. As a result, the rock expands, which causes the rock to crack.
5.In the scenario, weathering occurs when tiny bits of sand and shell in the waves loosen bits of sediment from the rock. Erosion occurs when the waves carry away those bits of sediment.
Around the edges of many dry areas, sensitive ecosystems depend on local plant life to maintain cool, moist conditions. When humans deplete these areas of vegetation, soil rapidly disappears. Which characteristic of plants MOST likely helps to prevent soil erosion?
pollination cycles
root systems
release of moisture from leaves
photosynthetic activities
Answer:
Root systems.
Explanation:
In response to seasonal changes in temperature, many organisms must alter the composition of their plasma membranes to maintain the proper degree of fluidity. As summer turns to fall and eventually into winter, which of the following would you predict you would observe in the plasma membranes of organisms that are unable to regulate their body temperature?A. an increase in phospholipid fatty acid side chain length and an increase in side chain saturationB. a decrease in phospholipid fatty acid side chain length and an increase in side chain saturationC. a decrease in phospholipid fatty acid side chain length and a decrease in side chain saturationD. an increase in phospholipid fatty acid side chain length and a decrease in side chain saturation
Answer:
C. a decrease in phospholipid fatty acid side chain length and a decrease in side chain saturation
Explanation:
Temperature is a factor that has a huge impact on cell membrane structure, more precisely its fluidity. So, for example, if temperature increases, the cell membrane becomes more fluid because the fatty acid tails of the phospholipids become less rigid.
In Europe, three lineages of bears evolved from a common ancestor. Two of those lineages led to present-day black bears and brown bears. The third lineage led to cave bears that went extinct 24,000 years ago. Which of the following could explain why only one group of bears went extinct? A. Individual cave bears must not have been able to adapt to changing conditions as quickly as brown or black bears. B. One group of bears was less highly evolved than the other two groups and was destined to die out. C. Some environmental change severely threatened cave bear survival but not the survival of brown or black bears. D. Random chance led to the extinction of cave bears and survival of brown and black bears.
Answer: A Individual cave bears must not have been able to adapt to changing conditions as quickly as brown or black bears.
Explanation:
If an any living thing can not adapt to its surroundings, then the species will go extinct as it will no longer be able to survive in those surroundings. Brown and black bears were able to adapt to the changing conditions and thus survived until today.
Final answer:
The extinction of cave bears, in contrast to the survival of black and brown bears, is most plausibly explained by environmental changes that severely threatened cave bear survival. Factors such as adaptation capabilities, dietary flexibility, and impact of human expansion play significant roles in the survival or extinction of species.
Explanation:
The question asks why only one group of bears went extinct, given that three lineages evolved from a common ancestor in Europe, leading to present-day black bears, brown bears, and the now-extinct cave bears. There are several explanations for the extinction of only one group, but the most plausible reason is related to environmental changes and adaptation. Specifically, Option C: Some environmental change severely threatened cave bear survival but not the survival of brown or black bears, is a compelling explanation. This is supported by historical evidence indicating that environmental changes have played a significant role in the extinction of species, including large mammals, during periods of climate change and human expansion. The ability of species to adapt to changing environments, dietary flexibility, and geographical spread also significantly impact their survival. Unlike their relatives, cave bears may have had more specialized needs or were unable to adapt as effectively to changing conditions, leading to their extinction approximately 24,000 years ago.
Xavier boiled 45 grams of water. If all of the water changed into a gas, what would be the weight of the water vapor?
Answer:
45 g
Explanation:
Conservation of matter.
Final answer:
Xavier boiled 45 grams of water and the weight of the resulting water vapor will also be 45 grams, as the mass remains constant when water changes state due to the Law of Conservation of Mass.
Explanation:
If Xavier boiled 45 grams of water and all of it changed into a gas (water vapor), the weight of the water vapor would still be 45 grams. This is because the Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. When water boils and changes from a liquid to a gas, the substance is still water (H₂O), and thus the mass remains the same, just in a different state of matter.
When light passes from one medium to another, it undergoes reflection and refraction. Label the rays in the image as reflection and and refraction.
Answer:
Explanation:
Reflection of light is a phenomenon when light is thrown back by a smooth surface at the same angle as it hit the surface.
Refraction of light is a phenomenon of deviation of the direction of light when it moves from one medium to another medium due to the different speed of light in a different medium.
In the prism,
1. The light which is bounced back by the surface is- reflected light.
2. The light showing deviation in the direction of light- refracted light.
Final answer:
Light experiences reflection and refraction when transitioning between different media. Reflection causes light to bounce back, while refraction leads to changes in light's speed and direction relating to the media's refractive indices.
Explanation:
When light passes from one medium to another, it can undergo both reflection and refraction. Reflection is when light bounces off the surface of a medium rather than passing through it. On the other hand, refraction occurs when light does pass into the new medium, causing it to change speed and direction. The extent of this change in direction is dependent upon the indices of refraction of the two media involved. According to the law of refraction, a light ray will bend towards the perpendicular when it moves from a medium with a lower index of refraction to one with a higher index of refraction, and away from the perpendicular when it moves from a medium with a higher index of refraction to one with a lower index. This law of refraction is commonly referred to as Snell's Law and it quantifies how the angle of incidence and the angle of refraction are related to the indices of refraction of the two media.
enzymes that move certain phospholipids between leaflets have also which of the following properties?A. play a role establishing and maintaining membrane lipid asymmetryB. Transport proteinsC.Blocks post-synaptic membraneD.Interacts with neighboring epithelial cells, or basal membraneE. All of these are correct.
Answer:
A. play a role establishing and maintaining membrane lipid asymmetry
Explanation:
Proteins that move move certain phospholipids between leaflets are transmembrane proteins via "flip-flop" transition have also the possibility to maintain membrane lipid asymmetry. There are few types of such proteins:
flipases-move lipids from the exterior to the interior side of the membrane, energy requiredflopases-move lipids in reverse comparing to flipases, energy requiredscramblases-no energy required, bidirectionalBecause of the action of those proteins, cytosolic side of plasma membrane differs from exoplasmic side (asymmetry).
Under normal conditions which organisms in this community would have the greatest
The term mass wasting describes
the downslope movement of a landslide.
the process by which an area becomes a desert.
islands sinking into the ocean.
glacial movement of boulders.
Answer:
The down-slope movement of Earth's materials due to gravity.
Explanation:
Final answer:
Mass wasting refers to the downslope movement of earth materials driven by gravity and includes landslides, rock falls, slides, and flows, typically caused by factors that destabilize the slope.
Explanation:
The term mass wasting describes the downslope movement of rock and soil material due to gravity. It encompasses a range of movements including landslides, rock falls, rock topples, rock slides, and flows. Mass wasting can be triggered by seismic activity, volcanic eruptions, intense rainfall, and human activities that weaken slope stability. Key factors that influence mass wasting are the slope's angle and the shear strength of the slope materials.
When the shearing stress on earth materials exceeds their shearing strength, mass movement occurs. Landslide is a term often used synonymously with mass wasting, though it typically refers specifically to the rapid movements within this category. Therefore, out of the given options, mass wasting describes the downslope movement of a landslide.
A motorcycle traveling 35mi/hr slows as it approaches a stop sing this is an example of
Answer:
Distance
Explanation:
Hope i helped you.
A motorcycle traveling 35mi/hr slows as it approaches a stop sing this is an example of speed. Speed determines the approach to stop.
What do you mean by Speed?Speed may be defined as the ratio of the distance traveled by an object to the time required to travel that distance.
The concept of acceleration or speed is based on the fact of Newton's second law of motion. So, this is an example of it.
Therefore, a motorcycle traveling 35mi/hr slows as it approaches a stop sing this is an example of speed.
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Which description is NOT consistent with the sympathetic division?
long postganglionic fibers
ganglia close to the spinal cord
thoracolumbar
most innervation from the vagus nerve
most innervation from the vagus nerve
The vagus nerve innervates most of the parasympathetic division.
Answer:
most innervation from the vagus nerve
Explanation:
Peripheral nervous system consists of all the neurons and ganglia within the body, outside the central nervous system. It is divided into:
Somatic nervous system- it controls the movements of skeletal muscles which means that this nervous system is under the voluntary controlAutonomic nervous system- its role is to control involuntary movements of smooth muscles and glandsAutonomic nervous system consists of:
sympathetic nervous system -responsible for the "fight and flight" reactions (stressful situations but also for maintaining homeostasis)parasympathetic nervous system -opposite to sympathetic system, responsible for "rest and digest" reactions (body activities at rest)enteric nervous system-controls digestionThe description that is NOT consistent with the sympathetic division is 'most innervation from the vagus nerve'. The vagus nerve primarily serves the parasympathetic division.
Explanation:The description that is NOT consistent with the sympathetic division is 'most innervation from the vagus nerve'. The sympathetic division of the autonomic nervous system (ANS) is characterized by its thoracolumbar division and its ganglia being close to the spinal cord. It also features long postganglionic fibers. However, the vagus nerve primarily serves the parasympathetic division of the ANS, not the sympathetic division. Therefore, this description is inconsistent with the sympathetic division.
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A part of the body that is specialized for a certain function and made of groups of tissues is called a(n) _[blank]_.
cell
organelle
organ system
organ
The organ would be the correct answer
Answer:
The answer is organ
Explanation:
An organ is defined as the set of tissues that fulfill a certain function. It is made up of different kinds of tissues such as muscles or membranes. An example is the eyes, the skin, the heart, etc. The term vital organs is used to count those organs without which one cannot live, such as the lungs or pancreas.
Why is the fossil record of marine life more complete than that of organisms living in terrestrial ecosystems?
Answer:
It is because sedimentation will more often occur in marine ecosystems
Explanation:
Formation of fossils (through the process of fossilization) is a rare event because animal bodies are often eaten and decayed (destroyed by scavengers and decomposed by worms). But, fossilization can be achieved after the quick burial of an animal.
So, for example, dead marine animals might be buried by sediment that is carried by the water. Also, sediment can precipitate on the ocean floor, covering the remaining of dead animals.
Enzymatic catalysis of the peptide bond between the growing polypeptide and the next incoming amino acid takes place in which binding site?
Answer:
A site
Explanation:
During the process of translation, ribosomes play a major role in connecting mRNA codons with tRNA anticodons. Ribosomes are composed of two subunits which consist ofproteins and rRNA. The tree sites of ribosomes are:
P site or peptidyl site-this site binds to the tRNA which holds the growing polypeptide chain. A site or acceptor site-this is a site of peptide bond formation between the growing polypeptide and the next incoming amino acid E site or exit site-the site for the final binding of t-RNA .compare and contrast methods for obtaining data from earth's surface and earth's upper atmosphere
Answer:
Thermometers measure the temperature. Barometers measure air pressure. An anemometer measures wind speed. A hygrometer measures humidity. Instruments for gathering upper-atmospheric data is more complex than those used for obtaining data from Earth's surface. For example, a radiosonde consists of a package of sensors and a battery-powered radio transmitter.
Thermometers measure the temperature. Barometers measure air pressure. An anemometer measures wind speed. A hygrometer measures humidity.
What are Anemometers?An anemometer is a device that measures wind speed and direction. It is a common instrument used in weather stations. The earliest known description of an anemometer was by Italian architect and author Leon Battista Alberti in 1450.
Moreover, the anemometer counts the number of rotations, which is used to calculate wind speed. An anemometer is an instrument that measures wind speed and wind pressure.
Therefore, anemometers are important tools for meteorologists, who study weather patterns. They are also important to the work of physicists, who study the way air moves.
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The intrinsic growth rate is the maximum per capita growth rate when no environmental factors limit population increase.
True
False
Answer:
The answer is true. Hope this helps.
The intrinsic growth rate is the maximum possible per capita growth rate of a population when no environmental factors limit growth. This is seen under ideal conditions with abundant resources and lack of negative factors such as predators or disease.
Explanation:The statement is True. The intrinsic growth rate of a population is indeed the maximum possible per capita growth rate when no environmental factors limit population increase. This is usually observed under conditions that are optimal for the species, such as there are abundant food sources and space, lack of predators, disease, or other detrimental factors. For instance, if an animal species had unlimited resources and no predators, its intrinsic growth rate would be the maximum rate at which the population could increase.
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Beyond their role in energy transfer, what other benefit do microorganisms that act as producers provide for ecosystems
Microorganisms that act as producers in ecosystems contribute to nutrient cycling, form symbiotic relationships with plants, participate in bioremediation, and are integral to soil formation and stabilization.
Explanation:Beyond their role in energy transfer, microorganisms that act as producers provide a myriad of benefits for ecosystems. Microorganisms such as bacteria and fungi play crucial roles in nutrient cycling, including the carbon and nitrogen cycles. These cycles are essential for maintaining the balance of nutrients, such as carbon and nitrogen, in ecosystems.
Many microorganisms form symbiotic relationships with plants, such as nitrogen-fixing bacteria that associate with the roots of legumes, thereby enriching the soil with nitrogen that plants can use. Furthermore, microorganisms contribute to soil formation and stabilization, which prevents erosion and maintains soil health. This in turn supports plant growth and promotes biodiversity.
Microorganisms also engage in bioremediation, a process where they remove pollutants from the environment. This is vital for maintaining clean air and water. In addition, their decomposing action is necessary for the breakdown of organic matter, which replenishes nutrients in the ecosystems. These functions are indispensable for the survival not only of individual ecosystems but also of the planet as a whole.
What is the most effective way to generate potential solutions to a problem? how many alternate solutions should you generate?
Answer:
first we have to calm.be active in doing work .forgive other.be away from depression love other.be politebe kind honestcooperates with otherExplanation:
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People who sit for long periods of time are at a higher risk for heart disease, diabetes, and premature death.
Answer: Too much sitting linked to heart disease, diabetes, premature death. ... Over the course of these studies, people who sat for prolonged periods of time had a higher risk of dying from all causes even those who exercised regularly. The negative effects were even more pronounced in people who did little or no exercise.
Explanation:
About when did the first limbs evolve in tetrapods (land-dwelling vertebrates)?
Answer:
365 million years ago
Explanation:
The tetrapods are a super-family which includes all living and extinct vertebrates that have walked and are still walking the Earth, including the mammals, reptilians, dinosaurs, sinapsids, pterodactyls, amphibians, birds. They have evolved from fish-like creatures that were living in the shallows, and over the course of millions of years they were slowly changing and adapting to amphibian life, thus partially aquatic, partially terrestrial. The first proper limbs, at least what is know so far from the fossil records, have emerged with the ichthyostega and acoantostega around 365 million years ago. These two species were able to lift their body above the ground with their limbs, support its weight, and walk on them without dragging their body on the ground. The first transitional limbs can be seen in a species that has been dated to around 375 million years ago, the Tiktaalik, which had had limbs, but still not well developed, and it was only able to stand on them while in shallow water, but on on land.