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Lyrx [107]
3 years ago
9

Photosynthetic cyanobacteria caused an increase in atmospheric levels of

Biology
2 answers:
goldfiish [28.3K]3 years ago
6 0

C...the key is that they are photosynthetic...so they produce oxygen (like plants)!

Nuetrik [128]3 years ago
4 0

Answer:

C) oxygen

Explanation:

The gaseous product of photosynthesis is oxygen. Cyanobacteria are responsible for much of Earth’s early oxygen.

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