First mammals appeared in the period

Triassic

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Jurassic

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Cretaceous

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Tertiary

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Solution

The correct option is A Triassic
Triassic period, in geologic time, the first period of the Mesozoic era. It began 252 million years ago. Reptiles increased in diversity and number, and the first dinosaurs appeared during this period along with the appearance of first mammals. Thus the correct answer is option A.

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