First mammals occurred in which 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 B
Triassic - Mesozoic

Rise of first dinosaurs and egg-laying mammals occurred in Triassic period of Mesozoic era.

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First mammals occurred in which era period?

The correct option is B Triassic - Mesozoic Rise of first dinosaurs and egg-laying mammals occurred in Triassic period of Mesozoic era.

The correct option is B
Triassic - Mesozoic

Rise of first dinosaurs and egg-laying mammals occurred in Triassic period of Mesozoic era.