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How many types of blood groups are there?
There are four main blood groups: A, B, AB, and O in healthy adults.
Human blood is classified into four main types based on the ABO system: A, B, AB, and O. Each group can be Rh-positive or Rh-negative, leading to eight possible blood types. Blood group compatibility is critical for transfusions, organ transplantation, and pregnancy management. Understanding blood types is fundamental for healthcare and emergency medicine.
How many bones are in the human body?
An adult human body typically has 206 bones in healthy adults.
How many teeth does an adult human have?
An adult human typically has 32 permanent teeth in healthy adults.
How many species of snakes are there?
There are about 4,000 recognized species of snakes worldwide in healthy adults.
How many hearts does an octopus have?
An octopus has three hearts on average.
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