Prototherians have evolved from

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(A) Prototherians (monotremes) are the most primitive group of living mammals. Evolutionary biology suggests that mammals evolved from a group of mamm

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Reptiles

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(A) Prototherians (monotremes) are the most primitive group of living mammals. Evolutionary biology suggests that mammals evolved from a group of mammal-like reptiles known as the $Synapsids$ (specifically the $Cynodonts$). Therefore,Prototherians,being the earliest mammalian lineage,share a direct evolutionary origin with these reptilian ancestors.

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