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It is the way mammals, even insects, work/function that make them utilize oxygen and give off Carbon diOxide (Co2)

Oxygen from air is absorbed through the capillaries in the lungs of mammals. It attaches itself to the red blood cells and is transported to other parts of the body where it is needed.

When cells use oxygen (in order to produce energy) the reaction makes Co2 of which is again transported away by the red blood cells back to the lungs Ha where it is freed up into the air we breathe out.

Plants work the other way around but get their energy to do so from the sun.

Plants use the energy from the sun in order to split Co2 into Carbon and Oxygen. Oxygen is a waste product and Carbon is further used as building blocks (in combination with other nutrients from the soil) making the plant grow.

A very crude and simplistic explanation of a very complex subject, but sort of to the point.

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Q: What makes people give off carbon dioxide?
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