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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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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 Mary Turkina
by
7.4k points

1 Answer

12 votes

The answer is Letter D.

User Beatleman
by
6.9k points
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