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How many blood groups are there? What is their importance? |
Answer» <p>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).</p> <p> glands make saliva that makes your food moist </p> | |