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The "oxygen crisis" occurred around

hermiz

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7 years ago

The "oxygen crisis" occurred around

The "oxygen crisis" occurred around
A) 2 billion years ago
B) 3.5 billion years ago
C) 2.5 billion years ago
D) 4 billion years ago

Textbook

Life in the Universe

Edition: 4^th

Authors: Bennett, Shostak

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Life in the Universe, 4/E (Bennett, Shostak)

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19Clyde

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hermiz Author

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7 years ago

Brilliant ツ

elizabetheldrid

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Yesterday

Thank you, thank you, thank you!

cartoon

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2 hours ago

Smart ... Thanks!

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