1) Carbon is taken in by plants through photosynthesis to make carbohydrates, fats and proteins
2) Eating passes the carbon compounds in the plant along to animals in a food chain or web
3) Both plants and animals respire while the organisms are alive which releases CO2 back into the air
4) When plants and animals die and are decomposed, they’re broken down by bacteria and fungi. These decomposers release CO2 back into the air by respiration as they too are alive
5) Some useful plant and animal products, e.g. wood and fossil fuels, are burned (combustion). This also released CO2 back in the air
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