The amount of carbon on Earth is fixed and some carbon is locked up in fossil fuels, oil, coal and gas and is only realeased when burned. When carbon is released and locked up we call this the carbon cycle.
When green plants photosynthesise they use the carbon in the carbon dioxide to make carbohydrates, fats and protein. This carbon is then passed onto animals when they eat the plant. This is how carbon is taken out of the enviroment.
Living organisms respire, this is where they break down glucose with oxygen to produce energy in their cells and carbon dioxide is released as a waste material.
When an animal is broken down by detritus feeders these too will also respire to release carbon dioxide.
Combustion is when something is burned with the presence of oxygen and when coal or oil or gas is burned, carbon dioxide is produced from the locked up carbon in the fossil fuels.
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