What is the best explanation for why human embryos have a tail during development?
A. Humans inherited this pattern of development from an ancestor that had a tail.
B. The tail helps the embryo move while it is developing.
C. Humans share the same biogeography as other vertebrates with tails.
D. Humans do not have a tail after birth, so their embryos have one during development.
Answer: A
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a. true b. false
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