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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                    Answered by
            Anonymous
            
    does anyone know the answers i have like 30 minutes 
    
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