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The limbs of several organisms are shown in the illustrations below. scientists sometimes compare the limbs of these organisms to look for evidence of common ancestry.

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These limbs (see attached image) provide evidence of common ancestry because they have the same basic structure. In evolution we have convergent evolution and divergent evolution; In convergent evolution we focus on the analogous structure; which have different ancestry but perform similar functions while in divergent evolution, we have homologous structures which have a common ancestry and similar structure; but performs different functions, like the limbs described above. 
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Scientists compare the limbs of different organisms for looking evidence of common ancestry because body parts of an organism provides information about common ancestry.

Which substances show evidence about common ancestry?

Substances such as fossils, anatomy, embryos, and DNA sequences provide evidence about common ancestry. Those organisms are considered more closely related organisms that have more common characteristics so we can conclude that anatomy provides information about common ancestry.

Learn more about ancestry here: https://brainly.com/question/538031