What is the evidence for evolution? Biologists have worked hard through the one and a half centuries since Darwin published his theory of evolution to gather supporting evidence for it. Much of the initial evidence was rooted in the fossil record, which suggested species evolution from lower to more advanced organisms in context of a long age time reference. Evolutionary links between species were assumed based on skeletal and physical similarities, and stemmed back from an unknown universal common ancestor. But the understanding of genetics has challenged these initial views due to the surprising and unlikely gene matches that have been discovered. This leaves the accumulated evidence for Darwin's tree of life model in a conflicted position.

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