Multiple Choice
Oxygenic photosynthesis is made possible by the accumulation of oxygen in Earth's atmosphere and oceans. The primary producers of oxygen since 800 million years ago and those that power the modern carbon cycle are mostly:
A) cyanobacteria.
B) anoxygenic phototrophs.
C) algae and plants.
D) purple bacteria.
Correct Answer:
Verified
Correct Answer:
Verified
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