Proterozoic aeon
volume
British pronunciation/pɹˈəʊtɹəzˌəʊɪk ˈiːɒn/
American pronunciation/pɹˈoʊtɹəzˌoʊɪk ˈiːɑːn/

"proterozoic aeon"的定义和意义

Proterozoic aeon
01

from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms

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