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Agoston Horvath · Answer 1 · 2021-12-11T04:02:37+0000

Answer:

Carbon Dioxide

Step-by-step explanation:

The heart uses Oxygen and pumps it throughout the body, in return making more Carbon dioxide come out.

Doug Neiner · Answer 2 · 2021-12-14T18:24:45+0000

Answer:

Carbon dioxide

Step-by-step explanation:

Because The heart pumps the oxygen to the muscles that are doing the exercise. When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.

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