The most persuasive argument for common ancestry is existence of common DNA-based genes in diverse species. But there are at least three other plausible explanations -- parallel evolution, horizontal gene transfer, and [[creationism]].
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The most persuasive argument for common ancestry is existence of common DNA-based genes in diverse species. But there are at least three other plausible explanations -- [[parallel evolution]], [[horizontal gene transfer]], and [[creationism]].