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)an adaptation
B)a homologous structure
C)natural selection
D)a vestigial trait

Question

Quizplus · Accepted Answer

This is an example of a vestigial trait, which is a structure or behavior that has reduced in size or usefulness over time and no longer serves its original purpose. In this case, the crab's tail has reduced and no longer functions in swimming, likely due to its adaptation to life on land.

Many Crustaceans (E