Biology, 26.04.2021 23:00 hopkinbr

The atmosphere of Earth changed when plant life increased. Before there were plants, the atmosphere contained much less A. hydrogen.
B. oxygen.
C. nitrogen.
D. water.

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The atmosphere of Earth changed when plant life increased. Before there were plants, the atmosphere contained much less A. hydrogen. B. oxygen. C. nitrogen. D. water.

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Another question on Biology

The atmosphere of Earth changed when plant life increased. Before there were plants, the atmosphere contained much less A. hydrogen.
B. oxygen.
C. nitrogen.
D. water.