Following the reptilian extinctions at the close of the Mesozoic, two groups of

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Following the reptilian extinctions at the close of the Mesozoic, two groups of

Following the reptilian extinctions at the close of the Mesozoic, two groups of mammals, the marsupials and ________, evolved.
A) eukaryotes
B) cephalopods
C) trilobites
D) placentals
E) stromatolites

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