Asked by final exam please
8. Which event was responsible for the increase in oxygen in the atmosphere during Precambrian time? (1 point)
a series of volcanic eruptions
the evolution of land animals
a comet crashing into the planet
the appearance of photosynthetic organisms
a series of volcanic eruptions
the evolution of land animals
a comet crashing into the planet
the appearance of photosynthetic organisms
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does anyone know the answers i have like 30 minutes
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