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How does blood flow from a person's leg back to the person's heart?

A Gravity pushes the blood upward.
B Lungs pull the blood upward.
C Contracting leg muscles push the blood upward.
D Contracting heart muscles pull the blood upward.

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alabdullahshay

Answer:

A

Explanation:

A.  Gravity pushes the blood upwards

when you walk, stand or move at all, the muscles squeeze the veins and the blood flows.

OFF G00GLE JUST REWORDED A LITTLE.

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