First mammals are found in era-period

Permian...Palaeozoic

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Triassic....Mesozoic

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Tertiary....Coenozoic

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None of these

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Solution

The correct option is A None of these
The first known mammals were found in the Mesozoic era and the late Triassic period.

So, the correct answer is 'None of these'.

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First mammals occurred in which era period?

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