Scientists continuously find fossilized bodies of dinosaur bones that all appear to have died the same way. It is because of these discoveries that we know that dinosaurs and other pre-historic species existed on Earth 66 million years ago.
The evidence that points to the fact that there was a big extinction about 66 million years ago lies in the fossil records themselves.
Records and evidence show that for an estimated two hundred and thirty million years, Earth was home to lots of dinosaurs. Fragments of their skeletons such as teeth, bones, etc have been found on fossils which corroborates this position.
The interesting thing however is that when subjected to radiocarbon dating none of the dinosaur remains were in age, less than 66 million years. This can only mean that there was a massive catastrophe that wiped out life as it existed then.
There is also some evidence that suggests that a huge asteroid impacted the earth at that time causing the extinctions.
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What Is the purpose of an amino acid codon chart?
They specify the order of amino acids in a protein from N-terminus to C-terminus
Each group of three bases in mRNA constitutes a codon, and each codon specifies a particular amino acid (hence, it is a triplet code). The mRNA sequence is thus used as a template to assemble—in order—the chain of amino acids that form a protein.
need help fast please!!!
1)what are two types of non mendelian inheritance
2)a trait that is controlled by a non mendelian gene is...?
Answer:
1.) Size, Hair Color
2.)a trait that is not passed down with dominant and recessive alleles from one gene.
Explanation:
Maria assembled pictures of the organisms seen here to represent a simple aquatic food chain. What MUST Maria add to make this food chain model more accurate?
A)
Arrows to show the flow of energy.
B)
The sun and arrows to show the flow of energy.
C)
The sun, a producer, and arrows to show the flow of energy.
D)
Maria should color the organisms and then add arrows to show the flow of energy.
Sure, based on the image you sent, the best option to make the food chain model more accurate is option C)The sun, a producer, and arrows to show the flow of energy.
* The image shows a bird, a fish, and a shrimp. These are all consumers, meaning they get their energy by eating other organisms.
* A food chain shows the transfer of energy from one organism to another. In this case, the energy would flow from the sun to the producer (which is not shown in the image), then to the fish, and then to the bird.
* Arrows are used to show the direction of the energy flow. So, the model would need arrows to show that the energy flows from the sun to the producer, from the producer to the fish, and from the fish to the bird.
Therefore, the most accurate way to complete the food chain model would be to add the sun as a producer and arrows to show the flow of energy.
Here are some additional details that could be added to the model to make it even more accurate:
* The specific type of producer that the fish eats (e.g., algae, plankton)
* The specific type of fish that the bird eats
* The decomposers, which break down dead organisms and return nutrients to the ecosystem
Therefore, Option C is the correct choice.
What is a pathogen? A microorganism that helps in digestion A microorganism that causes diseases An organism which is harmed by fungi An organism which is harmed by a virus
A microorganism that can cause diseases
Answer:
A microorganism that can cause diseases
Explanation:
A pathogen is a micro-organism that can cause diseases. It is tiny and can infect you easily.
Recent research has found that on one island of the Galapagos two finch species interbred.This interbreeding may have resulted in a hybrid species that ultimately led to the extinction of one of the species Darwin discovered. They call this speciation in reverse, or despeciation. Based on what you know about speciation, why are these terms appropriate?
According to Darwin, Speciation is the process of formation of new species from a parental population. It occurs when the members of a similar population no longer interbreed one another to produce fertile offspring within their natural environment.
What are Species?Species may be defined as a group of organisms that can reproduce intrinsically with one another and construct fertile offspring.
A single species can generate multiple species via the mechanism of reproductive isolation.
These terms are more appropriate because they illustrate the difference in the behavior of two or more species on the basis of isolating mechanisms.
Therefore, it is well described above.
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Answer:
Speciation is the method by which unique species evolve from a common ancestor. In this case, two of these species that split from a common ancestor interbred and created a hybrid. This hybrid was apparently stronger and possibly better adapted to the environment, which led to extinction of a species formed by the initial speciation event.
Explanation:
this is the edmuntum sample answer
A neuron can have consecutive action potentials (one right after the next) without a break in between. true or false
A neuron can have a consecutive (one right after the next) without a break in between FALSE.
EXPLANATION: Neuronal refractory period The refractory period in a neuron occurs after an action potential and generally lasts one millisecond.
Which of the following is true about sexual reproduction?
A. The offspring are composed of haploid cells.
B. The offspring are genetically unique.
C. The production of offspring involves mitosis.
D. The production of offspring involves meiosis.
the answer to this question is c. the production of offspring involves mitosis
The production of offspring involves meiosis.
Explanation:The correct answer is D. The production of offspring involves meiosis. Sexual reproduction involves the fusion of two gametes, or sex cells, which are formed through the process of meiosis. Meiosis is a type of cell division that produces cells with half the number of chromosomes as the original cell. This is important because it allows the offspring to have a combination of genes from both parents, making them genetically unique.
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How long does a mutation last?
Answer:
How long does a mutation last?
AS Long As The Cell Lives
Explanation:
Answer:
C: As long as the cell lives. Hope this helps! :D
Explanation:
What are mutations?
A) changes in nucleotides of a DNA molecule that affect the genetic message
B) repairs of damage to DNA molecules by specialized enzymes
C) removal of damaged DNA nucleotides by enzyme molecules
D) reduction in the rate of replication of DNA due to regulatory mechanisms
Mutations are permanent alterations of the DNA sequence that can affect an organism's physical traits, potentially causing diseases like cancer. They can be caused by errors during DNA replication or by environmental factors like chemical mutagens and radiation. Mutations range from point mutations to large chromosomal changes and can be benign, beneficial, or harmful.
A mutation is a permanent alteration in the nucleotide sequence of a genome, which may occur due to various reasons such as damage to DNA, replication errors, or the action of mobile genetic elements. Mutations can lead to changes in an organism's phenotype or observable characteristics, playing a critical role in both normal and abnormal biological processes. This includes contributing to evolution, the emergence of cancer, and the complexities of the immune system.
Among the different types of mutations are point mutations (a change in a single nucleotide), insertions, deletions, and large-scale mutations that alter chromosomal structure. While some mutations are benign or even beneficial, others can be deleterious, leading to diseases like cancer, or even be lethal.
Mutagens, including radiations like X-rays and gamma rays, as well as chemical substances, can cause mutations. Some mutations occur spontaneously and can be passed on to next generations if they occur in germ cells, or remain confined to an individual if they occur in somatic cells.
a population of animals is split in half by a river. Before speciation is completed, the two halves are rejoined when a drought causes the river to run dry. How would this impact the two populations?
A. Traits that had developed through mutation would still exist in only one of the halves
B. Speciation would still occur because the two halves would be too different genetically to interbreed
C. The two halves would be reproductively isolated
D. Gene flow would increase between the two halves, and speciation would not occur
d
please give branlyist
Answer: D. Gene flow would increase between the two halves, and speciation would not occur
Explanation:
Speciation is a phenomena of evolution of a new species from the existing parent species. This occurs when the population of the species gets separated due to geographical barrier, behavioral and due to temporal isolation (having distinct mating seasons). The members of the separated populations may undergo with genetic variations and mutations which may likely to produce a new species.
According to the given situation, if the split halves rejoined then speciation would not occur because speciation requires time for genetic variations and mutations to occur. As, a result of rejoining of the two halves the gene flow will occur due to inbreeding and speciation would not occur.
Which feature is not found in all cells?
Nucleus is NOT found ALL cells.
Common features of cells include the cell membrane, the cytoplasm, and the cytoskeleton. Cells also have ribosomes, which are structures where proteins are made. . Cells are classified as prokaryotes or eukaryotes.
The smallest and simplest cells are prokaryotes. A prokaryotic cell is a cell that lacks a nucleus and other internal compartments. As a group they are also among the most ancient. Fossilized prokaryotic cells have been found in rocks over 3 billion years old. A eukaryote is a cell that has a nucleus and other internal compartments, known as organelles.
Hope this helps!!!!!!!!! ^_^
A feature that is not found in all cells is a nucleus as a nucleus is a membrane-bound organelle that is present in eukaryotic cells but not in prokaryotic cells, and the nucleus acts as the central repository for genetic material.
What is the significance of the different cells?In eukaryotic cells, the nucleus stores the genetic material and contains the cell's DNA in the form of chromosomes and it also plays an important role in regulating the expression of genes and controlling the cell's growth and division, while prokaryotic cells lack a nucleus and have a more simple structure than eukaryotic cells.
Hence, a feature that is not found in all cells is a nucleus as a nucleus is a membrane-bound organelle that is present in eukaryotic cells but not in prokaryotic cells, and the nucleus acts as the central repository for genetic material.
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Animals with 3 issue layers may be characterized by the presence or absence of a _____________.
Coelom
Animals with 3 issue layers may be characterized by the presence or absence of a Coelom.
Explanation;Animals may be characterized by the presence of a coelom, formation of the mouth, and type of cell cleavage during embryonic development.Diploblasts contain two germ layers that is the inner endoderm and outer ectoderm, while triploblasts contain three germ layers, that is; endoderm, mesoderm, and ectoderm.Triploblasts can be further categorized into those without a coelom called acoelomates, those with a true coelom called eucoelomates, and those with “false” coeloms known as pseudocoelomates.What is genetic drift
when you start to feel like someone from the different sex
Answer:
variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
hope this helps
What is the color of ozone?
O A. pale blue
OB. bright yellow
O c.
pale green
OD. white
Ozone gas does indeed have a slight blue color. It is dark blue in a liquid form and purple-black in solid form. The color comes from the fact that it absorbs all wavelengths of light other than those in the blue region.
Ozone gas has a pale blue color. It is a bluish gas that is often associated with the upper layers of Earth's atmosphere,.
Option A is correct.
What is the ozone?Ozone is a molecule made up of three oxygen atoms. It is a pale blue gas that is odorless and tasteless. Ozone is found in the stratosphere, the layer of Earth's atmosphere that is about 10 to 50 kilometers above the Earth's surface. Ozone absorbs ultraviolet radiation from the sun, which helps to protect life on Earth from the harmful effects of UV radiation.
Ozone is also found in the troposphere, the layer of Earth's atmosphere that is closest to the Earth's surface. However, ozone in the troposphere is harmful to human health. It can cause respiratory problems, such as asthma and bronchitis. It can also damage plants and crops.
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may somebody help me please.
Here you go buddy.
Answer:
4. c) The cell enters [tex]G_{1}[/tex].
Cytokinesis is the last step in the process of cell division and it begins prior to the end of mitosis, in anaphase. Through this process, the cytoplasm of the dividing cell is split in two, and thus two identical daughter cells are obtained. These cells are diploid and thus contain a full complement of chromosomes.
5. c) [tex]G_{1}[/tex] --> S --> [tex]G_{2}[/tex] --> mitosis --> cytokinesis.
The cell division process begins with a cell growth period known as interphase.
During [tex]G_{1}[/tex], the cell increases in mass in preparation for cell division. All cellular contents, excluding the chromosomes, are duplicated. This is followed by the S phase in which the chromosomes are duplicated. This step end in [tex]G_{2}[/tex] during which the cell continues to increase in mass and synthesize proteins. Here, the duplicated chromosomes are also checked for errors and repaired if necessary.
During mitosis, the chromosomes in the nucleus are divided into two new nuclei through the mitotic spindle. The cytokinesis is the last step in which the cytoplasm is divided evenly into two new daughter cells.
6. a) DNA replication
During synthesis, the DNA contained within the chromosomes is replicated. This will result in a complete copy of the genetic material. This stage is preceded by the [tex]G_{1}[/tex] phase and followed by the [tex]G_{2}[/tex] phase. These three phases composed the cell growth period known as the interphase.
7. d) interphase
The interphase is a period in which the cell grows in mass ([tex]G_{1}[/tex] and [tex]G_{2}[/tex] phases) as well as a replication of the genetic material (S phase). This will result in a larger cell that will contain a copy of all the structures and genetic material found before the interphase.
8. d) DNA copying: synthesis phase
[tex]G_{1}[/tex] is the first phase in the process known as interphase. It is characterized by a duplication off all cellular structures with the exception of DNA. The DNA is copied during the synthesis phase, which starts at the end of [tex]G_{1}[/tex]. This DNA will be checked for errors and repaired during the [tex]G_{2}[/tex] phase.
9. b) [tex]G_{2}[/tex]:S
During prophase, the chromosomes inside the cell’s nucleus condense in tight structures. These are then arranged in a line along the equator of the cell during metaphase. The DNA contained within the nucleus is duplicated in the S phase and then are checked for errors during [tex]G_{2}[/tex].
10. c) The nucleus is divided into two nuclei
The genetic material that has been duplicated during the S stage of the interphase, will need to be divided so that two identical daughter cells may result. This occurs during the stage of cell division known as mitosis. The end result will be two nuclei that will belong one to each daughter cell.
11. b) Metaphase
Metaphase is the third of five step that compose the cellular division process known as mitosis. During this stage, the duplicated chromosomes in the S stage of interphase are arranged in a line along the equator of the cell. These in turn will be divided and thus for two new nuclei from that of the original cell.
What actions help protect the land?
different laws actually help protect the land
A learner says that Earth rotates on its axis as it revolves around the sun in a circular orbit and that the sun is at the exact center of this orbit. What mistake did the learner make?
Explain the mistake in detail. Your answer should include at least two complete sentences. Be sure to check your grammar and spelling.
The earth’s orbit around the sun is a perihelion. The orbit is also not a true elliptic circle because the orbit is influenced by other nearby celestial orbits such as the planets in the solar system. On occasion, the orbit is deformed putting a particular part of the earth’s orbit closer to or farther from the sun. Also, the barycentre of the solar system changes as the alignment of the solar system’s celestial bodies varies over time.
Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar.
A population of hyenas inhabits a tropical savanna. At the beginning of the year, there were 100 hyenas in the population. Throughout the year, 20 hyenas died, 35 hyenas were born, 5 hyenas migrated into the population, and no hyenas left the population. What was the size of the population at the end of the year?
At the end of the year, there were (blank) hyenas in the population.
Answer:
120 is the size of the population at the end of the year
Explanation:
Size of the population is given by
Total number of Hyenas present in the population + Total number of Hyenas born + Total number of Hyenas migration into the population – Total number of Hyenas died
Substituting the given values in above equation, we get -
[tex]= 100 + 35 + 5 -20\\= 120\\[/tex]
120 is the size of the population at the end of the year
At the end of the year, there were 120 hyenas in the population.
Step 1: Calculate the change in population due to births, deaths, and migration:
Starting population: 100 hyenas
Deaths: 20 hyenas
Births: 35 hyenas
Migration in: 5 hyenas
Migration out: 0 hyenas
Step 2: Calculate the net change in population:
Net change = Births - Deaths + Migration in - Migration out
Net change = 35 - 20 + 5 - 0 = 20 hyenas
Step 3: Determine the population size at the end of the year:
Population at the end of the year = Starting population + Net change
Population at the end of the year = 100 + 20 = 120 hyenas
Step 4: Conclusion:
At the end of the year, there were 120 hyenas in the population.
The striking molecular similarities that exist between Earth's many diverse species can best be explained by A. random changes that occur separately in each species' genetic code. B. the sharing of common ancestors within the species' evolutionary history. C. the inability of the species to undergo evolutionary change over time. D. species mating with other species to produce offspring.
Answer:
B
Explanation:
While we may have many species on earth, they all share a common ancestor known as the cenancestor. Even when comparing the genomes of many different species on earth, these are a number of genes (approximately 300) that have been conserved throughout these species some of these being associated with cellular respiration and central dogma.
Answer: Option B
Explanation:
There are many different types of organism that is related to each other. Some of the organisms have been evolved from other organisms.
Two organism are said to be similar because the organism are closely related to each other. They have more recent common ancestors.
The characters in the organism are similar because they are related to each other by their ancestry.
Match each organism with the correct description.
1. algae
omnivore
2. deer
carnivore
3. hawk
scavenger
4. human
decomposer
5. vulture
producer
6. mushrooom
herbivore
1. Algae
producer
2. Deer
herbivore
3. hawk
carnivore
4. human
omnivore (honestly a really broad statement but overall yes most humans are omnivores c:)
5. vulture
scavenger
6. mushroom
decomposer
hope this helps! :)
Answer:
1. Algae (Producer ) [Because all algae species are autotrophs]
2. Deer (Herbivore) [Because deer eat vegetation]
3. Hawk (Carnivore ) [They eat flesh]
4. Human (Omnivore ) [Eat everything including greens and flesh]
5. Vulture (Scavenger) [Feeds on dead remains]
6. Mushroom (Decomposer) [Degrades organic matter in soil]
DNA contains all the genetic information within an organism. DNA translates nitrogenous bases into proteins. DNA contains many chromosomes that are passed from parent to offspring during reproduction.
DNA is the genetic material responsible for inheritance and is passed from parent to offspring for all life on earth. DNA must be replicated accurately to preserve its integrity. DNA also directs and regulates protein synthesis in a cell.
Explanation:DNA serves two essential functions that deal with cellular information. First, DNA is the genetic material responsible for inheritance and is passed from parent to offspring for all life on earth. To preserve the integrity of this genetic information, DNA must be replicated with great accuracy, with minimal errors that introduce changes to the DNA sequence. A genome contains the full complement of DNA within a cell and is organized into smaller, discrete units called genes that are arranged on chromosomes and plasmids. The second function of DNA is to direct and regulate the construction of the proteins necessary to a cell for growth and reproduction in a particular cellular environment.
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DNA contains genetic information, but it does not directly translate nitrogenous bases into proteins. Chromosomes carry genetic material and are passed during reproduction.
DNA Contains Genetic Information:
DNA (deoxyribonucleic acid) is a molecule that carries genetic information in all living organisms. It consists of sequences of nucleotides containing adenine (A), thymine (T), cytosine (C), and guanine (G). The order of these nitrogenous bases forms the genetic code.
DNA Does Not Directly Translate Nitrogenous Bases into Proteins:
The process of translating genetic information into proteins occurs through a two-step process: transcription and translation. DNA serves as a template for RNA (ribonucleic acid) during transcription. Nitrogenous bases in RNA (adenine, uracil, cytosine, and guanine) complement those in DNA. The mRNA (messenger RNA) produced during transcription carries the genetic code to the ribosomes, where translation occurs, converting the code into proteins.
DNA Contains Chromosomes Passed During Reproduction:
DNA is organized into structures called chromosomes. Chromosomes carry genes, which are segments of DNA that encode specific traits. During reproduction, chromosomes are passed from parent to offspring. In humans, for example, each parent contributes half of the chromosomes to the offspring, ensuring genetic diversity.
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Which is not an echinoderm?
A)sea star
B)sea urchin
C)sand dollar
D)spider
Answer:
An echinoderm is a marine invertebrate. Starfish, Sea urchin, and Sand dollars are all echinoderms. A spider is an arachnid. Which means a spider is *NOT* an echinoderm.
Answer: D) Spider
Hope this helps. :-)
Answer:
D)spider
Explanation:
Starfish, Sea urchin, and Sand dollar, all of following are echinoderms. A spider is a an arachnid.
During chilly days, you might notice lizards lying (“basking”) in sunny areas. Why do lizards bask in the sun?
Question 10 options:
Ectothemic animals are lazy and the sun puts them to sleep.
Ectothermic animals need to get tanned by the sun's rays for camouflage.
Ectothermic animals use the suns rays to help them hide from enemies.
Ectothermic animals need the warmth from the sun to allow them to move around and hunt for food.
Answer:
It is D : Ectothermic animals need the warmth from the sun to allow them to move around and hunt for food.
Explanation:
I took the test and it said it was right
Lizards bask in the sun because ectothermic animals need the heat of the sun to move around and hunt for food.
What are ectothermic beings?When we talk about ectothermic animals, we are talking about beings that need external sources to maintain their temperature. This means that they need to be exposed to the sun or stay in a warm place, such as rocks. One group of animals that has this characteristic is the reptiles.
From this information, we can conclude that lizards warm in the sun because ectothermic animals need the sun's heat to move around and hunt for food.
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Many inlets form when severe storms carry large amounts of sand from around the mouths of streams or rivers out to sea. This fast erosion may seem negative, but it can help create a unique type of habitat.
This habitat is known as
A) a lake habitat.
B) a marine habitat.
C) an estuary habitat.
D) a barrier reef habitat.
The correct answer is c.
Answer:the person is right thank you (:
Explanation: lol i had the same question like this on usatestprep
Examine the weather map. The arrows are pointing to the line with triangles. What does the line indicated by the arrows most likely represent?
a front
an isotherm
high winds
high humidity
The correct answer is - a front.
On this image, the lines are representing a front, and since the signs are marked with blue color, it means that it is a cold front. The fronts are advancing masses of air. In this case, we have a cold front, thus we have advancing cold air masses in the western part of the US, and in the Great Lakes region and the northeastern part of the country. This means that these areas will be affected by colder air masses, that will bring in higher air pressure, colder weather, and cold winds from the direction from which these cold fronts are coming.
Simple Answer:
A front
<Jayla>
How many bones in the body
206 bones are in the body
The adult human skeleton consists of 206 bones, although this number was around 270 at birth, the bones fuse together over time forming 206 bones.
PLEASEEEEEE I NEED HELP IN THIS QUESTION!!!!! 78 Points!!!!
The answer would be D
What is bio geochemical cycling?
Answer
Hi,
Geochemical cycling is the flow of substances or elements that occurs between reservoirs in Earth’s atmosphere, the water bodies and the lithosphere.
Explanation
A geochemical cycle is normally the path followed by chemical elements in the surface and crust of the Earth. The cycle starts with the crystallization of magma in the lithosphere at the surface or at depth. Weathering and surface alteration follows breaking down igneous rock that will be transported and deposited as sediments. The sediments become lithified and later metamorphosed until melting happens to form new magma.
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A Density Independent Limiting Factor is a limiting factor of a population that can affect the population growth no matter what the population density.what is a density independent limiting factors that can affect the human population growth of South Carolina?
A). Tornadoes
B). Water supply
C). Living space
D). Disease
Answer:
A. Tornadoes
Explanation:
Tornado is a climate change that is density independent factor, and will exert influence on the size of population, no matter what is the density of that population. While on the other hand their are density dependent factors, whose effect become intense as the size of that particular population increases e.g. spread of a certain disease in an area will be more where people are living in close proximity.
Answer: A. Tornadoes
Explanation:
What kind of a Erosion involves dissolved particles
The kind of erosion that involves dissolved particles is CALLED CHEMICAL EROSION.
Erosion refers to the action of surface processes which removes soils, rocks or dissolved materials from one point on the earth surface and transport it to another site.
Chemical erosion is the process by which a rock or other geological features are broken down as result of chemical process. Chemical erosion is also known as chemical weathering. The process of chemical erosion is brought about by water which react with mineral grains in rocks and soils to form new mineral grains and soluble salts. This is especially true for acidic water. Examples of chemical erosion are carbonation, hydrolysis, hydration and oxidation.