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Sonbull [250]
3 years ago
9

During exercise, the __________ use oxygen faster, so the _________ have to work harder.

Biology
2 answers:
Mrac [35]3 years ago
6 0

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

coldgirl [10]3 years ago
4 0
A as the lungs take in oxygen and give it carbon dioxide
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