The disaster called the Cambrian explosion resulted in a tremendous mass extinction.
True
False
Final answer:
The Cambrian explosion is falsely attributed as a disaster; in reality, it was a significant period of evolutionary diversification following a mass extinction in the Precambrian, not a mass extinction itself.
Explanation:
The statement 'The disaster called the Cambrian explosion resulted in a tremendous mass extinction' is false. The Cambrian explosion was not a disaster, but rather a period of rapid evolutionary diversification. After the Precambrian mass extinction, which ended around 544 million years ago, there was a dramatic increase in the diversity of life forms during the Cambrian period. This burst of evolution resulted in the appearance of most of the major animal phyla as seen in the fossil record, laying the foundation for modern biodiversity.
Mass extinctions have indeed occurred at different times in Earth's history, but these are distinct events, separate from the Cambrian explosion. The Cambrian explosion represented an era of extraordinary diversification and the origin of complex multicellularity. The new forms of life rapidly evolved into a wide variety of organisms, such as primitive sponges and small ocean invertebrates like trilobites.
A reef results from life processes. True False
you can tell that this is an image of a dna nucleotide and not an rna nucleotide because you see a _____.
You can identify a DNA nucleotide by the presence of a deoxyribose sugar, instead of ribose, and the presence of the base thymine, instead of uracil like in RNA. The key components of a nucleotide are a nitrogenous base, a pentose sugar, and one or more phosphate groups. DNA and RNA differ in the type of pentose sugar and one of the bases they incorporate.
Explanation:You can tell that this is an image of a DNA nucleotide, and not an RNA nucleotide, because you see a deoxyribose sugar instead of ribose. Additionally, you can look to see if there is the base thymine present, which is in DNA, instead of uracil, which is in RNA.
Nucleotides are the building blocks of DNA and RNA. Each nucleotide comprises a nitrogenous base, a pentose sugar, and one or more phosphate groups. The carbon residues in the pentose are numbered 1' through 5' (with the prime distinguishing these residues from those in the base, which are numbered without applying a prime notation). The base is affixed to the 1' position of the ribose, and the phosphate to the 5' position. When a polynucleotide forms, like a DNA or RNA molecule, the 5' phosphate of the incoming nucleotide connects to the 3' hydroxyl group at the end of the growing chain.
The critical difference lies in the pentose sugar included in the nucleotide. DNA contains deoxyribose, which is similar in structure to ribose that is found in RNA. However, deoxyribose has an H instead of an OH at the 2' position.
Moreover, DNA nucleotides incorporate the four bases adenine (A), guanine (G), thymine (T), and cytosine (C). In contrast, RNA uses uracil (U) as a substitute for thymine (T). So, if you see a nucleotide with thymine, that is a direct indicator of DNA. By understanding the core differences between DNA and RNA nucleotides one can easily distinguish between them by examining a given image or model.
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what prefix would you add to lysis to mean separate or split using water?
To indicate the splitting or separation of a compound using water, the prefix 'hydro-' is added to 'lysis', forming the word 'hydrolysis'. This chemical reaction is crucial in breaking down polymers into their monomeric units.
The prefix you would add to lysis to mean separate or split using water is hydro-. The complete term is hydrolysis, which is a chemical process where water is used to split a substance into smaller molecules. In the context of polymers, hydrolysis plays an essential role by breaking the covalent bonds between monomers, splitting them into smaller units, often through the addition of a hydrogen ion (H+) to one monomer and a hydroxyl group (OH) to the other, effectively dismantling the polymer chain.
Human well-being is tied to biodiversity because:
a.
humans love to look at beautiful things.
b.
humans are part of the food webs and energy cycles that a great variety of organisms share.
c.
less biodiversity makes humans vulnerable to extinction.
d.
humans need a wide variety of animal species for hunting and wildlife products.
e.
the less biodiversity the less risk of disease.
1. For the pedigree in Figure 14-6, shaded symbols represent afflicted people. Males are squares; women are circles. If the trait is a sex-linked trait carried on the X chromosome, what is true about the mother represented by circle 1? *She has two alleles for the disorder. *She has one allele for the disorder. *She has no alleles for the disorder. *She has the genotype XXY
The answer to your question is:
B. She has one allele for the disorder.
I hope this helps
2. In Africa, Nile crocodiles can often be seen lying in the sun, their jaws held open. Small white egrets perch on the crocodiles’ backs or hop in and out of their mouths. The birds also peck at the crocodile’s teeth, feeding on the scraps of food embedded there. Although crocodiles do eat some birds, they do not eat egrets.
a. What is the term for the relationship between the crocodiles and the egrets?
b. Explain this relationship.
Answer:
Mutualistic symbiotic relationship
Explanation:
1. The relationship between egrets and the crocodile is a form of symbiotic relationship that is predominantly mutualistic relationship
2. In a mutualistic symbiotic relationship , two species associate with each other in order to benefit each other. Here egrets feed on food scrap stuck in the teeth of crocodile to feed itself while on the other hand crocodile is also benefited as the waste left out of food stuck in its teeth is cleaned off.
Which of the following statements about pesticides is true?
a.
Pesticides provide plants with essential nutrients.
b.
Pesticides prevent the destruction of crops.
c.
Pesticides are never harmful to plants.
d.
Pesticides are never harmful to animals.
Answer: The correct answer is-
b. Pesticides prevent the destruction of crops.
Pesticides can be described as chemicals, which are primarily are used to control/ kill pest population that can other destroy the crops.
In other words, they are utilized in crop protection against pest such as weeds, insects, and other pests.
For instance, caterpillars, which feed on cabbage crop, are killed using pesticides, leading to high yields and better cabbage quality.
By preventing crops from destruction by pests, these chemicals lead increase in the crop yields, and the times in one year that a crop could be cultivated on the field.
Thus, option b) is the right answer.
The activity of the kidneys is controlled by hormones and by ?
The activity of the kidneys is controlled by hormones and by pituitary gland.
What is pituitary gland?Your pituitary gland (also known as hypophysis) is a small, pea-sized gland located at the base of your brain below your hypothalamus.
What are four functions of the pituitary gland?Through secretion of its hormones, the pituitary gland controls metabolism, growth, sexual maturation, urinary hormones ,reproduction, blood pressure and many other vital physical functions and processes.
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Which mutation in DNA affects the whole DNA sequence after the point mutation?
A.
inversion
B.
frameshift
C.
substitution
D.
translocation
Answer:
D. translocation
Explanation:
Select all that apply.
Carbohydrates are found in foods that contain:
starch
protein
amino acids
fats
sugar
Answer:
The answer is starch and sugar
Explanation:
The active form of vitamin d is
Sweating is a process that helps cool the body during strenuous exercise. This is an example of
Answer:
The answer is 3 if its on ur test
Explanation:
outline how impulses are transmitted from receptor to effector ...?
A receptor is a stimuli receiver. It receives an information and sends it through a sensory neuron to the spinal cord, as a part of the central nervous system. So, the spinal cord sends information received from the body to the brain. Further brain sends the processed information back to the spinal cord which relays it out through a motor neuron to the effectors (muscles or glands).
What is the difference between entomophily and anemophily?
Helppp pleaseeee !
1. The bodys nonspecific defenses against invading pathogens include ?
A.antibiotics
B.mucus, sweat, and tears
C. antibodies
D. cytotoxic T cells
2. The body's most important nonspecific defense is ?
A. The skin
B. Cell mediated immunity
C. the inflammatory responce
D.permanent immunity
The most important part of the body that shows non-specific defense against invading pathogens is skin (A). They include sweat, acid, mucus, oil in non-specific defense (B).
Further Explanation:
Skin is the major organ of the body, which has several features that shield the body from infections. Skin plays a very important role in nonspecific defense against pathogens. The skin surface receives the secretions from the sweat glands which contains lysozyme. This enzyme is responsible for digesting the bacterial cell wall. This feature alone does not make the skin barrier to infections. The acidic pH and mucus secretion also contribute to the barrier properties of the skin.
The sweat glands and oils are accountable for the acidic pH of 3-5 of the skin surface. This pH is acidic enough to inhibit the growth of pathogenic microorganisms. The skin surface receives the secretions from the sweat glands which contains lysozyme. This enzyme is responsible for digesting the bacterial cell wall. The mucus that is secreted by the skin is a sticky fluid that is responsible for trapping the microorganisms.
The mucus that is secreted by the skin is a sticky fluid that is responsible for trapping the microorganisms. This is one of the few characteristic features of the skin that is responsible for acting as a barrier to infection.
Learn more:
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Answer Details:
Grade: High School
Subject: Biology
Topic: Non-Specific Defense
Keywords:
Skin surface, non-specific defense, skin, lysozyme, interferons, complements, trap, Micro-organism, cell wall, sweat gland, oil, surface.
What is one major difference between sandstone and slitstone
Organisms that live in the tundra have developed unique adaptations that aid in their survival. Ursus maritimus has a variety of adaptations which enable it to survive in the tundra. It is the largest terrestrial carnivore, but it is also an excellent swimmer that spends much of its time in and near the water hunting its favorite food. It has large paws with small bumps to provide traction as it walks across the ice. Its fur is helpful as camouflage during the winter months, but not as helpful during the summer. Which organism has the adaptations described that enable it to survive in the tundra?
A. harp seal
B. arctic fox
C. polar bear
D. Kodiak bear
What is the probability of an offspring inheriting to the recessive trait if its parents are both heterozygous?
will upvote<3;p
Why do the atoms in the top rows in the Periodic Table have higher electronegativity than atoms in lower rows?
a)The electrons of those atoms are farther from the nucleus.
b)The electrons of those atoms are closer to the nucleus.
c)The electrons of those atoms are part of the nucleus.
"The correct answer is b) The electrons of those atoms are closer to the nucleus.
Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond. In the periodic table, electronegativity generally increases from left to right across a period and decreases from top to bottom down a group.
The reason for the trend across periods is due to the effective nuclear charge experienced by the valence electrons. As one moves from left to right across a period, the number of protons in the nucleus increases, which increases the nuclear charge. However, since all the electrons are added to the same principal energy level, the added electrons do not screen the outermost electrons from the nucleus effectively. This results in a greater effective nuclear charge pulling the valence electrons closer to the nucleus, thus increasing the electronegativity.
In contrast, as one moves down a group, the valence electrons are in higher principal energy levels, which are further from the nucleus. Despite the increase in the number of protons and electrons, the added inner electrons effectively screen the outermost electrons from the increased nuclear charge. This results in a decrease in the effective nuclear charge on the valence electrons, and thus a decrease in electronegativity.
Therefore, atoms in the top rows of the periodic table have higher electronegativity because their valence electrons are closer to the nucleus due to the higher effective nuclear charge, which is not effectively screened by inner electrons. This makes it harder for these atoms to lose electrons and easier to gain them, leading to a higher electronegativity."
suppose a population is carrying a condition controlled by two alleles R (dominant) and r (recessive). if the frequency of the r allele is 15% and the frequency of the R allele is 85%. what will be the frequency of the RR genotype ,assuming evolution is not occuring?
Answer:
Frequency of the RR [tex]= 72.25[/tex]%
Explanation:
Given -
R is the dominant allele and r is the recessive allele.
The frequency of the r allele is [tex]15[/tex]%[tex]= 0.15[/tex]
The frequency of the R allele is [tex]85[/tex]%[tex]= 0.85[/tex]
As per Hardy Weinberg's equation-
[tex]p = 0.85[/tex]
[tex]q = 0.15[/tex]
Also, evolution is not occurring is the basic assumption of Hardy Weinberg's principle.
Frequency of the RR genotype is equal to [tex]p^{2}[/tex]
Substituting the value of "p" we get
[tex]p^{2} = 0.85^{2} \\= 0.7225\\= 72.25[/tex]
The genus Cnemidophorus is a large group of whiptail lizards that are found in both North and South America. These lizards undergo a process in which their unfertilized eggs can develop into new individuals.This process is called
A. sexual reproduction.
B. binary fission.
C. parthenogenesis.
D. budding.
Answer:
C. parthenogenesis.
Explanation:
Parthenogenesis is a type of reproduction which occurs in extreme conditions in which an off-spring is born from an ovum (egg) even if the egg does not get fertilized by the male gamete. It is a type of asexual reproduction. It is exclusive to only a few invertebrates and lower plants. Parthenogenesis term is derived from a greek word which means "virgin birth". Since the new individual is reproduced out of an unfertilized egg the progeny resembles only one parent i.e. mother.
Sunlight is a form of energy called _____.
Sunlight is a form of energy known as electromagnetic radiation or solar energy, and the portion that humans can see is termed visible light. It travels in waves, measurable by their wavelength.
Sunlight is a form of energy called electromagnetic radiation or solar energy. This solar energy is composed of tiny packets of energy known as photons. While the Sun radiates a vast amount of this energy, the part that humans can see is called visible light. Solar energy travels in waves, which can be measured in terms of their wavelength - the distance between two consecutive points like crest to crest or trough to trough.
The sun is the Earth's primary source of energy and it emits light and heat through a process called nuclear fusion, where hydrogen is converted into helium, releasing vast quantities of energy. This energy travels across space and reaches Earth mostly in the form of visible light, which we can harness and utilize as an energy resource.
Which is a reason for the rise of nitrate levels in ground water?
What is a force that causes an object to change its shape?
Which of the following best describes the relationship between climate and latitude?
The greater the latitude, the colder the climate.
A latitude of 0o has a climate of extreme temperature ranges.
There is no relationship between latitude and climate.
The lower the latitude, the colder the climate.
Answer:
The best answer choice to the question: Which of the following best describes the relationship between climate and latitude, would be: A: The greater the latitude, the colder the climate.
Explanation:
The explanation is best given not with the understanding of latitudes and climate, but rather, the position of the Earth in regards to the Sun, and its movements, that will bring places further away from the equator (latitude 0), closer to the direct rays of the sun, or further away. However, it is also important to know that as locations move away from the equator, towards higher latitudes, meaning, towards the poles, these places will have lower temperatures, than those on the equator, and definitely will have temperature changes, going from high, to low, depending mostly, on Sun exposure, due to the changes in position of Earth. This also explains why places at greater latitudes experience seasons, and not those at the equator.
Which path describes the movement of oxygenated blood leaving the heart? Use the standard image of the heart to guide you.
left atrium → left ventricle → aorta
left ventricle → left atrium → pulmonary artery
right atrium → right ventricle → pulmonary artery
right ventricle → right atrium → aorta
The answer is left atrium - left ventricle - aorta
Its right because I had it in my test and it says t right. Make me a brainlist if u dont mind plz.Number the following events of plant evolution in sequential order.
1-rise of multicellularity.
2-rise of eukaryotes.
3-rise of chemoautotrophs and photoautotrophs.
4-rise of bryophytes.
5-rise of cyanobacteria.
6-rise of angiosperms.
7-rise of gymnosperms
Answer;
rise of chemoautotrophs and photoautotrophs rise of cyanobacteria - a specific type of phototroph that shares homology with chloroplast genome rise of eukaryotes rise of multicellularity rise of bryophytes - mosses rise of gymnosperms - conifers, cycads & ginkgo rise of angiosperms - flowering plantsExplanation;
Plants are multicellular organisms that have evolved the ability to live on land. The vast majority can carry out photosynthesis, but they are not the only organisms with this ability: many protists can photosynthesize too, as can several important groups of bacteria.
Plants are thought to have evolved from a class of freshwater green algae called the charophytes. Two particular groups of charophyte, the Coleochaetales and the Charales, resemble the earliest land plants (bryophytes) in a variety of ways, including the structure of their chloroplasts and sperm cells, and the way their cells divide during mitosis .
The correct order of the events of plant evolution is 2,5,3, 1, 4, 7 and 6.
The sequential order of the events of plant evolution:
2 - Rise of eukaryotes.
5 - Rise of cyanobacteria.
3 - Rise of chemoautotrophs and photoautotrophs.
1 - Rise of multicellularity.
4 - Rise of bryophytes.
7 - Rise of gymnosperms.
6 - Rise of angiosperms.
The evolution of plants are:
1. Rise of Multicellularity: This evolution marks the change from unicellular to multicellular life.
2. Eukaryotes are complex celled organisms that contain organelles that are bound by membranes.
3. Chemoautotrophs and photoautotrophs are organisms that can make their own food, and both are on the rise.
4. Photoautotrophs use sunlight, while chemoautotrophs require inorganic materials.
5. Emergence of Cyanobacteria: Blue-green algae, commonly called cyanobacteria, were the first photosynthetic organisms, and they had a major impact on the development of Earth's atmosphere.
6. Gymnosperms are a group of plants that have seeds that are not contained within the fruits from which they emerge. These include conifers, cycads, and ginkgo trees.
7. Angiosperms are the most numerous and dominant class of plants on Earth today. These are commonly called flowering plants.
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The amnion is an extra-embryonic membrane that surrounds the embryo and encases it in amniotic fluid.
Which animal lacks an amnion?
A) frog
B) lizard
C) pigeon
In humans, there is a phenotype for curly hair and a phenotype for straight hair. The homozygous dominant genotype CC is for curly hair, and the homozygous recessive genotype cc is for straight hair. Heterozygous Cc is a phenotype for wavy hair.
In a hypothetical population, 36% of people are born with straight hair (cc). What percentage of this population will have wavy h