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How does exercise help the cardiovascular system? O It weakens the heart. O It slows the heartbeat. O It changes hormone levels. O It increases the oxygen in the blood.
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3 votes
How does exercise help the cardiovascular system?

O It weakens the heart.

O It slows the heartbeat.

O It changes hormone levels.

O It increases the oxygen in the blood.

User Californian
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1 Answer

6 votes
It would be option 4
User NicoD
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