Where does the carbon dioxide come from
that we exhale during cellular respiration?

The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat. The carbohydrates, fat and proteins we consume and digest are eventually converted by a number of different biochemical pathways in the body to glucose (C6H12O6)

Explanation:

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the animal that would be cutest if scaled down to the size of a cat? elephant