Protists are not monophyletic due to diverse evolutionary lineages with shared ancestry with plants, animals, and fungi, making them a paraphyletic group known as Kingdom Protista.
Protists are not considered a monophyletic group because they do not share a common ancestor exclusive to them. Instead, they have diverse evolutionary lineages that include shared ancestry with plants, animals, and fungi, leading to their classification as a polyphyletic group. Molecular genetics has shown that some protists are more related to animals, plants, or fungi than to each other, making the former classification as Kingdom Protista paraphyletic.
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