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A taxon that does not include the last common ancestor of all its members is a _____ group.

User Sunny Pun
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A monophyletic taxon is also called a clade. Paraphyletic taxon : A group composed of a collection of organisms, including the most recent common ancestor of all those organisms. Unlike a monophyletic group, a paraphyletic taxon does not include all the descendants of the most recent common ancestor.

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