Homologous structures in different species from "summary" of On the Origin of Species By Means of Natural Selection by Charles Darwin
Homologous structures in different species are those which, in their different species, are similar in their form and function, suggesting a common ancestry. The concept of homologous structures provides compelling evidence for evolution, as it implies a shared evolutionary history between species. For example, the forelimbs of humans, bats, whales, and birds all share a common structure despite their different functions. The bones in these forelimbs are similar in their arrangement and development, indicating a common evolutionary origin. This similarity cannot be attributed to chance or design, but rather to a shared ancestry....
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