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Evolution

The scientific theory according to which populations change gradually through a process of natural selection.

5,264 Questions

What is capable of evolution?

Evolution is a process in which something passes by degrees to a different stage, especially a more advanced or mature stage. In biology it is the sequence of events involved in the evolutionary development of a change in a species. All living things are capable of evolution.

What is a hypothetical population?

Statistical population which has no real existence but is imagined to be generated by repetitions of events of a certain type.

Why was the evolution of nucleic acids important to the evolution of protocells?

Nucleic acids have a number of important features. They are self replicating, and they also have the capacity to synthesize proteins. These proteins, in turn, can regulate or cause all other biochemical processes involved in life. So nucleic acids become the means to store information about how any organism functions, and to bring about those functions as needed.

How does the human eye invalidate evolution?

It doesn't.The human eye is sometimes used as an example of something called 'irreducible complexity'. This is a doctrine which states that because each and every part of the eye is necesary to its functioning, and that if any part is removed the eye ceases functioning as it did, that it could not have naturally evolved piece by piece and must therefore have been created by some intelligent designer.

It is a common fallacious argument put forward in support of creationism as opposed to evolution.

It is completely debunked by the simple fact that just because a part is necessary now, does not mean it was always necessary. A part is added because it is useful, and then later parts build on it, so that eventually the first part is necessary for all others; the otehr parts also build dependence over time, until the complexity is reached and appears irreducible.

The argument is similarly broken by the mousetrap analogy. Mousetraps were used as examples of irreducible complexity, because if you remove any part it no longer works as a mousetrap. However, as simply pointed out, removing certain parts makes a very effective catapult or a very simple tie clip.

What is the difference between divergence and speciation?

Divergent speciation refers to the rise of a new species when organisms that can interbreed and reproduce fertile offspring get separated. Separation can be due to geographical barriers like mountains and lakes.

What best describes all sauropod dinosaurs?

I would say one thing is that all sauropods were herbivores.

Why are vestigial structures considered critical evidence of evolution?

Vestigial structures are considered evidence, but no more critical than any other line of evidence in Biology and palaeontology. They're considered evidence, not because of their function, but because of the way their morphologies follow the nested hierarchies of biology: the vestigial legs of whales, for instance, have exactly the kind of shape we would have expected them to have if whales had descended from land mammals. The same goes for human tailbones and embryonic branchial ridges, the wings of emus, and so on.

Evolutionists often make the distinction between evolution as a fact and evolutionary theory What does this mean?

Evolution is descent with modification. Or, change over time. And formally as the change in allele frequencies over time in a population of organisms. This is an observed and a observable fact. The theory is; the theory of evolution by natural selection, which explains the fact of evolution. Natural selection is the main mechanism ( there are others ) that drives the adaptive change in organism that can lead to speciation, or just simple evolution.

The three major categories of evidence provided by the fossil record are?

The three major categories of evidence provided by the fossil record are body fossils (actual remains of organisms), trace fossils (impressions or structures left by past organisms), and chemical fossils (organic molecules preserved in rocks). These categories help scientists understand past life forms, their environments, and evolution over time.

In xmen evolution what power does jubilee have?

Jubilee's power is to shoot fireworks out of her hands. hope this helped.

What is a morphological trait?

a trait based on appearance, i believe.

How numerous base changes could occur in DNA yet have no effect on an organism's fitness?

Any number of base changes in DNA not coding for or controlling the coding of gene expression would have no effect on an organisms fitness.

What could changes in our ancestors' teeth tell us about the evolutionary history of humans?

One simple thing is diet. Large molars and massive jaws indicate that rough vegetable matter the required heavy mastication was being consumed. Australopithecus robustus, for instance.

You do not want to change though you believe in evolution?

I do not ' believe ' in evolution, but I am convinced by the evidence.

The hominid fossil has the same number of bones in its hand as a gorilla. what type of evidence for evolution does this represent?

That evidence is homologous. Shared common ancestry. In this case you could trace this homology back as far as the common ancestor of gorillas and hominid fossils, or as far back as the emergence of all tetrapods.

What happens when Rare allele is in a small population?

The smaller the population the greater the frequency the allele will increase. When the Old Order Amish came to America in 1744 it was a husband and wife. One of them was a carrier for a recessive genetic mutation. As time went on and inbreeding occured because of the small population more and more children were born with the genetic disorder.

6 Explain why evolution by natural selection can not occur if the variation in a characteristic does not contribute to differences in fitness?

If there is not reproductive fitness conveyed by a variant trait, then natural selection has nothing to select and nothing to promote into the populational gene pool.

What is evolutionary heritage?

Evolutionary heritage means the history of life before the species being studied. For example, what sort of life came before humans, horses, birds and even fish. The progression of one species into another until the species seen today.

What may have occurred to prevent species that are of the same grade from also belonging to the same clade?

similar structures arising independently in different lineages, convergent evolution among different lineages, and adaptation by different lineages to the same selective pressures

What is fad in compressor?

FAD stands for Free Air Delivery which indicates the compressors capacity, it normally described in: L/Sec, m3/min or cfm. Quote: The capacity of a compressor is the full rated volume of flow of gas compressed and delivered under conditions of total temperature, total pressure, and composition prevailing at the compressor inlet. It sometimes means actual flow rate, rather than rated volume of flow. This is also called free air delivery (FAD) i.e. air at atmospheric conditions at any specific location. This term does not mean air delivered under identical or standard conditions because the altitude, barometer, and temperature may vary at different localities and at different times.

Do organisms evolve slowly over time and can two different organisms have a common ancestor?

Yes they evolve slowly over time and a panda and raccoon have common ancestors.

Why is evolution reffered to as a theory?

I don't exactly know why evolutionists refer to it as a theory, but I do know this.

A theory is an explanation or model based on observation, experimentation, and reasoning.

According to the definition of a theory, evolution is not a theory. Evolution cannot be based on observation. No one was here to observe it. So evolution should be classified as a hypothesis not a theory. It is only a guess as to how things came about.

How are alleles frequencies related to gene pools?

The frequency of the allele represents the percentage of that allele in the gene pool

Why is it that lamarck's suggestion that organisms arise spontaneously and then become increasingly more complex is not supported by the theory of natural selection?

Because lamarck thought that traits organisms aquired during their lifetime would be passed on to offspring. He believed that traits were determined by use or disuse. However, aquired traits cannot be passed on to offspring, only traits determined by DNA can.