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gogolik [260]
3 years ago
14

The TEST IS TIMED PLEASE HURRY

Health
1 answer:
kogti [31]3 years ago
3 0

Answer: A) Heart and lungs

Explanation:

The heart becomes more efficient with every beat as it pumps oxygen-carrying blood, the lungs more effective in taking in oxygen, and the muscles more equipped to use more oxygen.

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