Chimpanzees and Gorillas Share the Trait of Knuckle-Walking,which Humans Do

question 20

Multiple Choice

Chimpanzees and gorillas share the trait of knuckle-walking,which humans do not generally have.Why do most scientists NOT classify chimpanzees and gorillas as each other's closest relatives?

• A) The majority of genetic evidence places chimpanzees closest to humans, not to gorillas.
• B) Fossil evidence suggests that knuckle-walking was present in ape ancestors and is not a uniquely derived trait for chimpanzees and gorillas.
• C) Chimpanzees and humans share more unique features in common than either share with gorillas.
• D) Fossil apes that are thought to be closest to humans show adaptations for knuckle-walking, implying that humans have secondarily lost the trait.
• E) All of the above.

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