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What important change in the atmosphere occurred during the Proterozoic Eon?
A. Helium escaped into space and hydrogen was bound into water molecules
B. Nitrogen and carbon dioxide levels decreased, fueling bacteria growth
C. Carbon dioxide levels increased, causing glaciation that cooled the planet
D. Methane levels decreased and oxygen levels increased, promoting aerobic life forms

Sagot :

andiedeleon
Proterozoic Eon, the younger of the two divisions of Precambrian time, the older being the Archean Eon.

D. Methane levels decreased and oxygen levels increased, promoting aerobics life forms

Brainlessly answer pls
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