Which 2 chambers of the heard contain oxygen-rich blood?
A. Left Atrium and Left Ventricle
B. Right Atrium and Right Ventricle
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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.
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