Modern humans do not need wisdom teeth. Some people never have them, and other people need to get them removed. What does the existence of unused structures, such as wisdom teeth, suggest about the ancestry of
humans?
A. Humans in the 18th century used their wisdom teeth to chew raw
plant material.
B. Humans evolved from chimpanzees, who use their wisdom teeth
to digest their diet.
C. Humans evolved from an earlier species that had wisdom teeth,
which were important to the survival of the earlier species.
D. Wisdom teeth may help humans survive as conditions on Earth
change.