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Fynjy0 [20]
3 years ago
15

About three billion years ago, single-celled organisms called cyanobacteria lived in Earth’s oceans. They thrived on the ocean’s

abundance of ___ , which they used during the process of photosynthesis. Much later, this process allowed organisms, such as fish, to survive by extracting dissolved ___ from ocean waters.
a. oxygen
b.carbon dioxide
c. nitrogen
Biology
1 answer:
Whitepunk [10]3 years ago
4 0
The answer is C. nitrogen
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