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Many Crustaceans (E

Question 21

Multiple Choice

Many crustaceans (e.g.,lobsters,shrimp,and crayfish) use their tails to swim,but crabs have reduced tails that curl under their shells and are not used in swimming.This is an example of


A) artificial selection.
B) an extinction.
C) the law of succession.
D) a vestigial trait.
E) natural selection.

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