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Carbon dioxide is a waste product to humans and animals. Trees "breath" carbon dioxide and oxygen is their waste product (during daytime). Animals and humans breath oxygen and breath out carbon dioxide. When our cells circulate, they go through the pulmonary artery to the lungs and collect oxygen. They then go back through the heart and out into the rest of our body. Cells bring oxygen to the parts of our body that need it. Their waste is carbon dioxide which is exhaled.

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Q: Is carbon dioxide a waste product?
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