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★ Circulatory System Quiz
What do Red-Blood cells do?
A. Carry oxygen from the lungs to the body cells and transport carbon dioxide from the cells back to the lungs B. keeps blood flowing in one direction to the heart and prevent blood from flowing backwards C. Collects blood from the capillaries and drain it into the veins D. Bring nutriients to the cells and carries away waste materials.
Select your answer:
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