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Which one of these statements is true regarding blood circulation?

A. For health and survival, it's critical for blood circulation to be ongoing and uninterrupted.

B. Normally, blood circulates in a repeating stop-start rhythm.

C. The heart deoxygenates blood that's returned to it.

D. Taking in large quantities of oxygen makes the circulatory system less efficient.

i don't know this one can you help?

  • health -

    It is A!

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