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There are four principles at work in evolution—variation, inheritance, selection and time. The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.

Answer: scientists collected fossils that showed species changing over time

Darwin collected specimens from around the world during the HMS Beagle voyage

Darwin proposed the theory of evolution by natural selection

Mendel proposed laws for how traits are inherited

Scientist examine evolutionary relationships using DNA sequencing

Explanation:

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Universidad de Mexico