Carbon follows this pathway through the food chain on Earth so that all living things are using carbon, building their bodies until they die.
A tiny part of the carbon on the Earth is called Carbon-14 (C14), or radiocarbon.
During the period of a plant's life, the plant is taking in carbon dioxide through photosynthesis, which is how the plant makes energy and grows.
Animals eat plants, and some eat other animals in the food chain.
After twice that time (about 11000 years), another half of that remaining amount will have disappeared.