Question

what are the two key concepts of darwin theory of evolution?​

Answer 1

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Darwinism is a theory of biological evolution developed by the English naturalist Charles Darwin (1809–1882) and others, stating that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce

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Answer 2

1) diverse groups of animals evolve from one or a few common ancestors;
2) the mechanism by which this evolutiontakes place is natural selection.