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Health, 12.07.2019 07:00 Fortnitenerd2238

The valves of the heart and veins are similar in that they both a.) prevent the backflow of blood b.) act as propellers to move blood forward c.) prevent blood from flowing too quickly d.) are made of rigid cartilage

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The valves of the heart and veins are similar in that they both a.) prevent the backflow of blood...
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