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

Video transcript

Hello everyone here We have a question that says birds like penguins have wings like their ancestors. However, they do not utilize it for flying as their ancestors did. Such trade is an example of characteristics that once had a necessary function but aren't important, as modern species are called vestigial traits, so our answers are a dominant trait. This is incorrect. Be recessive trait. This is incorrect. See vestigial structure. This is correct. De trait brought about by mutation. This is incorrect. So our answer here is c vestigial structure. Thank you for watching. Bye.