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The _______ adapt to be able to take in more oxygen, and the ______ become more efficient at using oxygen A. arms legs B. brain, spinal cord C. heart, lungs D. lungs, muscles
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22 votes
22 votes
The _______

adapt to be able to take in more oxygen, and the ______
become more efficient at using oxygen


A. arms legs
B. brain, spinal cord
C. heart, lungs
D. lungs, muscles

User Ruiaureliano
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3.0k points

1 Answer

9 votes
9 votes

The answer is Letter D.

User Supernatural
by
3.2k points
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