Multiple Choice
Which of the following best describes what happens when a small star dies?
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A species of crayfish that lives in caves produces eyestalks like its above-ground relatives, but has no eyes. Eyestalks in cave-dwelling crayfish are thus ________.
a. An evolutionary error
b. A dominant mutation
c. Biogeographical evidence of evolution
d. A vestigial trait
e. Evidence that evolutionary theory may be incorrect