Question

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

Earth's temperatures increased, causing widespread evaporation.
Earth collided with a large object, forming the moon.
Single-celled organisms released oxygen into the air when they photosynthesized.
Single-celled organisms absorbed harmful gases from the air when they first formed.

Answer 1

c

Step-by-step explanation:

Answer 2

c; Single-celled organisms released oxygen into the air when they photosynthesized.

Step-by-step explanation:

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