As early organisms evolved and multiplied, they depleted oxygen from the atmosphere.

Name: As early organisms evolved and multiplied, they depleted oxygen from the atmosphere.
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Early organisms such as photosynthetic bacteria actually released oxygen into the atmosphere through photosynthesis, increasing the amount of oxygen present. It was the later evolution of more complex life forms and their increased oxygen consumption that led to fluctuations in atmospheric oxygen levels.

As Early Organisms Evolved and Multiplied, They Depleted Oxygen from the Atmosphere