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They do the same thing that all living and breathing things do! They breathe! When they breathe they are doing the same thing you are doing all day everyday. Inhaling oxygen and exhaling carbon dioxide.
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Answer:

They increase the amount of carbon in the atmosphere

Explanation:

Carbon is usually introduced into the atmosphere in a gaseous form. The atmosphere is the gaseous envelope round the earth.

When animals respire, they take up food materials from plants and other sources. They then metabolically break it down.

Oxygen is needed for respiration and in turn, the waste product is usually carbon dioxide.

So, respiration by animals releases carbon dioxide as a by product.

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