The blood in our bodies is like a mail system that delivers important things to help our cells be healthy. Your blood contains red blood cells, white blood cells, and platelets. Red blood cells have the important job of taking oxygen to all the parts of your body. White blood cells help our body to fight diseases. Platelets help our bodies to stop bleeding when we have a cut. People have dierent blood types: O, A, B, and AB.
cells: n. the smallest units of a plant or animal
Unit 7
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