Question

Explain the role of organisms in the carbon cycle.
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Answer 1

Organisms drive the carbon cycle by moving carbon between the atmosphere, land, and oceans. Plants, algae, and some bacteria remove CO2 through photosynthesis and build organic matter; animals and microbes transfer that carbon through food webs by eating and being eaten. All organisms respire, returning CO2 to the atmosphere, while decomposers break down dead organic matter and release CO2 (or methane under anaerobic conditions). Marine organisms also sequester carbon in shells and sediments, and over long timescales biological material can become fossil fuels that humans release by burning.