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iris [78.8K]
3 years ago
14

* Will mark brainliest to first correct answer*

Biology
2 answers:
Mrrafil [7]3 years ago
7 0

Answer:

oxygen: it was the result of biological activities. There were such stable continental shelf environments, which were rare in the Archean, developed after 2.5 billion years ago, facilitating the growth of photosynthetic organisms and thus oxygen production.

photoshop1234 [79]3 years ago
6 0
That would be A oxygen.

Oxygen is a product of photosynthesis. Photosynthesizing organisms used CO2 and released a lot of O2 to the atmosphere.
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Answer:

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Explanation:

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5 0
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Answer:

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Explanation:

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3 years ago
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mario62 [17]

Answer:

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Helpful Tip:

To know which base goes with which

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