Question

How does carbon exist in our world?

Answer 1

The atmosphere, biomass(plants), animals, fossils and fossil fuels

Explanation:

Carbon exists in the atmosphere as `CO_2`
Plants absorb the carbon dioxide and convert it to glucose `(C_6 H_12 O_6)` through photosynthesis.
Animals eat the plants so now the carbon is stored in them. They release the carbon back into the atmosphere through respiration.
Both plants and animals die and become buried. Over millions of years they are converted into fossil fuels, such as coal oil and gas, all of which contain carbon compounds.
burning fossil fuels releases `CO_2` into the atmosphere.