The carbon cycle is the process in which carbon is recycled throughout earths ecosystems. The three main storage places or reservoirs of carbon include the atmosphere, fossil fuels, and the oceans.
Carbon is released into the atmosphere through respiration, which is when organisms breathe. It can also be released during combustion (a.k.a. burning) of fossil fuels and other things.
Carbon is released when dead orgasms decay or decompose. These decayed organisms can eventually become fossil fuels in a very long time under the right conditions.
All this carbon released in the atmosphere can be absorbed by plants during photosynthesis which is a process in which plants convert the suns energy to glucose.
The carbon can keep cycling through these processes and can be stored in thinks called carbon sinks. Carbon sinks are things that absorb carbon from the atmosphere and they include forests/ vegetation, the oceans, and fossil fuel reserves.