Answer the following question given this paragraph: 

Carbon moves through ecosystems in two cycles that overlap. In the biotic cycle, it moves between living things and the air. In the abiotic cycle, it moves between the air, ground, and oceans. By burning fossil fuels, humans have increased the amount of carbon dioxide in the air.


Q: In what part of the carbon cycle does carbon move between living things and the air?


A:
biotic cycle