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Masja [62]
2 years ago
9

We know that the atmosphere became more oxygen-rich around 1.8 billion years ago (Ga) because of geologic evidence such as Choos

e one:
A. redbeds that formed after 1.8 Ga.

B. abundant fossils of land plants, signifying the start of photosynthesis.

C. BIFs that occurred prior to 1.8 Ga but disappeared from the rock record after that time.

D. the presence of abundant pyrite after 1.8 Ga.
Biology
1 answer:
Inessa05 [86]2 years ago
3 0

Answer:

A. redbeds that formed after 1.8 Ga.

Explanation:

Red beds are known to be as the rocks which are sedimentary which are red in colour and contain high amount of ferric oxides.

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