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Which event in Earth's history most directly allowed life to exist on land?

Which event in Earth's history most directly allowed life to exist on land?
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Which event in Earth's history most directly allowed life to exist on land?

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User Eunjoo
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Answer: Single-celled organisms released oxygen into the air when they photosynthesized.

Step-by-step explanation:

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User Micessien
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Answer: Single cell organisms absorbed harmful gases from the air when they first formed

Step-by-step explanation:

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User Wdtj
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