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In which eon of Earth's history did dinosaurs and mammals first appear?

adreamer

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In which eon of Earth's history did dinosaurs and mammals first appear?

In which eon of Earth's history did dinosaurs and mammals first appear?
A) Hadean
B) Archean
C) Phanerozoic
D) Proterozoic

Textbook

Life in the Universe

Life in the Universe

Edition: 4^th

Authors: Bennett, Shostak

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Donskoy

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