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Helga [31]
4 years ago
15

Many scientists hypothesize that the development of organisms with which ability led to the collection of oxygen in earths atmos

phere
Biology
1 answer:
alekssr [168]4 years ago
4 0

The correct answer would be photosynthesis

Why? - oxygen built up in the atmosphere after prokaryotes became autotrophic or became able to use photosynthesis.  

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