Why do problems with the heart lead to difficulty breathing?
a. the heart is the organ that brings carbon dioxide from the air.
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b. the circulatory and respiratory systems work together
c. the pumping action of the lungs moves oxygen through the body.
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d. the lungs transfer white blood cells to the heart.

Heyhonestly, probably not. humans have always had a tendency to waste things. whether it's food, cosmetic, infrastructure, or our abandoned constructions,the landscape is littered with the refuseof man. archaeology wouldn't be a developed discipline if humans didn't leave things behind. in a way it makes us human

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The answer is b. hope this !