The evolution of land organisms was not possible until enough ________ had been made by the early forms of aquatic life.

Name: The evolution of land organisms was not possible until enough ________ had been made by the early forms of aquatic life.
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Question

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Land organisms require oxygen for respiration, which was produced by early forms of aquatic life through photosynthesis. Without sufficient oxygen in the atmosphere, land organisms could not have evolved.

The Evolution of Land Organisms Was Not Possible Until Enough