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How many blood groups are there? What is their importance?

Answer»

Within the ABO group, four major categories are divided intoeightcommon blood types: A, B, O, and AB. Over 9.5 million people in the United States (U.S.) are blood donors, and around 5 million patients receive blood each year, according to the Centers for Disease Control and Prevention (CDC).

glands make saliva that makes your food moist



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