A swim bladder is a gas-filled sac that helps fish maintain buoya...

Question

A swim bladder is a gas-filled sac that helps fish maintain buoyancy. Evidence indicates that early fish gulped air into primitive lungs, helping them survive in stagnant waters. The evolution of the swim bladder from lungs of an ancestral fish is an example of
a. an evolutionary trend.
b. paedomorphosis.
c. the gradual refinement of a structure with the same function.
d. exaptation.

Accepted Answer

Hello everyone here. We have a question that says a trade feature or structure that serves a purpose but was not evolved by natural selection for its intended function is referred to as a adaptation. Adaptation is a feature produced by natural selection for its function that it currently serves. So A. Is incorrect B. Nhi and Nhi Nhi and Nhi is the mature form of an animal retaining its juvenile characteristics, so B. Is incorrect and see except ation expectation is a trade feature or structure that serves a purpose but was not evolved by natural selection for its intended function, So C. Is correct. So our answer here is Except ation. Thank you for watching. Bye.

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