Answer :
Carbon Cycle.
Carbon is an element which is found plentifully within our Earth. It is an surviving element which is found in every single living organism residing in Earth.
Carbon cycle is a process where the atoms of carbon are reused again and again. In this process, the carbon passes into the Earth and its living creatures from the atmosphere and then it the same process repeats back again. To make it simple, the carbon cycle process is very similar to that of water cycle.
A very fix amount of carbon is present in Earth and its atmosphere, that same carbon is recycled again and again which helps in supporting the life on our planet.