How do organisms change over time according to evolutionary theory?

Answer 1

The Theory of Evolution does not seek to how life began, although there are several very credible hypotheses for the beginning of life on Earth.

Individual organisms often differ from both of their parents, at least in quite minor ways. People have taken advantage of these changes by selecting the most desirable plant or farm animal to breed from. Thus, over time, new and better varieties are developed. Nature has the same ability to develop new varieties, whenever a chance variation gave the individual an advantage.

Charles Darwin believed that [in nature] a well marked variety can justly be called an incipient species, although the variety, for any number of reasons, may never progress to becoming a distinct species. If a variety were to flourish so as to exceed in numbers the parent species, then it would become the species, and the parent as the variety; or it may come to supplant and exterminate the parent; or both might coexist and both rank as independent species.

The principal driver of evolution is natural selection. Where a variation gave an individual a greater chance of surviving and passing on its genes, then that variation would flourish. Further favourable variations could gradually lead towards development of an entirely new species.

Some species, such as peacocks, can not readily be explained by natural selection. The explanation in this case is sexual selection.

Answer 2

Darwins hypothesis was the theory of evolution by natural selection

Answer 3

Organic Evolution

Answer 4

That is his theory.

Answer 5

Darwin

Answer 6

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