21. Evolution by Natural Selection
Descent with Modification
0:45 minutes
Problem 9c
Textbook Question
Textbook QuestionA 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
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