What is the rarest blood type in humans?
Correct answer: A. AB-
- A. AB-
- B. O+
- C. AB+
- D. O-
Explanation
Among the eight commonly taught ABO and Rh blood groups, AB-negative is the rarest. Rarity can vary by population, and very unusual types such as Rh-null are not included in these options.
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The human body is studied through its organ systems, including digestion, respiration, circulation, excretion, nervous coordination, reproduction and immunity. Coverage also includes nutrients and deficiency diseases, hormones, blood groups, common infections, vaccines, sanitation and basic first aid, while distinguishing communicable diseases from inherited and lifestyle disorders.
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