Which is true for the beginning of the Cenozoic era? A.) Mammals and dinosaurs lived together. B.) Mammals first appeared. C.) Dinosaurs had killed all mammals. D.) Dinosaurs were extinct.

Which is true for the beginning of the Cenozoic era?

A.) Mammals and dinosaurs lived together.
B.) Mammals first appeared.
C.) Dinosaurs had killed all mammals.
D.) Dinosaurs were extinct.

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