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The IF function only evaluates a condition if the condition is true.
HIV
Human Immunodeficiency Virus, a virus that attacks the immune system, leading to AIDS if not treated.
Monophyletic
Referring to a group of organisms that consists of all the descendants of a common ancestor.
Descendants
Offspring or future generations derived from a common ancestor.
Ancestor
A person, plant, animal, or object from whom one is descended, typically one more remote than a grandparent, such as a great-grandparent or beyond.
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