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Scilla [17]
3 years ago
14

Scientists have hypothesized that oxygen began to build up in the Earth's atmosphere after the development of living things with

the ability to A. breathe air. B. form tissues. C. photosynthesize. D. reproduce sexually.
Biology
2 answers:
kirza4 [7]3 years ago
8 0
C. photosynthesize

I hope this helps:)
Kruka [31]3 years ago
7 0

Answer:

The answer is c. photosynthesize

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