Final answer:
Blood type O is the most common blood type in humans and is considered the universal donor. Blood type AB is the universal acceptor.
Explanation:
Blood type O is the most common blood type in humans. Human blood types are determined by alleles inherited from parents, which lead to the blood group types A, B, AB, and O. Blood type O is considered the universal donor, while blood type AB is considered the universal acceptor due to the antigens present on the red blood cells.
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