which event in earths history most directly allowed life to exist on land?\no earths temperatures increased…

which event in earths history most directly allowed life to exist on land?\no earths temperatures increased, causing widespread evaporation.\no earth collided with a large object, forming the moon.\no single - celled organisms released oxygen into the air when they photosynthesized.\no single - celled organisms absorbed harmful gases from the air when they first formed.

which event in earths history most directly allowed life to exist on land?\no earths temperatures increased, causing widespread evaporation.\no earth collided with a large object, forming the moon.\no single - celled organisms released oxygen into the air when they photosynthesized.\no single - celled organisms absorbed harmful gases from the air when they first formed.

Answer

Answer:

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

Brief Explanations:

Oxygen is crucial for aerobic life on land. Photosynthetic single - celled organisms like cyanobacteria released oxygen into the atmosphere, which allowed for the development of an oxygen - rich atmosphere and the evolution of aerobic organisms that could live on land. Earth's temperature increase and evaporation didn't directly enable land life. The moon - forming collision had no direct link to land life. Absorbing harmful gases by single - celled organisms wasn't the key factor for land life existence.