helpMePLEASE0101 helpMePLEASE0101

12-09-2018
Biology

contestada

Photosynthetic cyanobacteria caused an increase in atmospheric levels of
A) ozone
B) water
C) oxygen
D) carbon dioxide.

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ksalmon1 ksalmon1

12-09-2018

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

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Susanknows Susanknows

09-05-2019

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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