The primary function of the carbon cycle is to recycle the supply of carbon on Earth.
The answer is Forests and Oceans. Both of them occupy most of Earth's surface, Reflects the least amount of sun, and absorbs a lot of the sun's energy due to photosynthesis and photosynthetic organisms.
It should be equal
nothing is lost, nothing is created
The abundance of abiotic factors, like light, water, and shelter, limit the amount of biotic factors.