Question

Carbon dioxide is returned to the atmosphere when

Answer 1

we breathe

Answer 2

i think lol

Answer 3

Returned to the atmosphere means the carbon dioxide came from the atmosphere recently. CO2 can be absorbed by plants and then released when the plants burn or when they are eaten by animals and the animals respirate. CO2 is also dissolved in water to form carbonic acid, it is only soluable when the water is a certain temperature, so as the water warms up, the CO2 can be returned, etc.

Answer 4

Research "carbon cycle" for more details.