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During exercise, the __________ use oxygen faster, so the _________ have to work harder.
A. lungs, muscles
B. muscles, lungs
C. muscles, glucose
D. glucose, lungs

Respuesta :

A. lungs, muscles because I went through them one by one and that's the only one that makes sense to me

Hope this helped :D
A as the lungs take in oxygen and give it carbon dioxide

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