What does a model of the carbon cycle show? The amount of Earth’s carbon increases.

The amount of Earth’s carbon is constant.

The amount of Earth’s carbon decreases.

The amount of Earth’s carbon cannot be determined.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong