In early evolutionary history,primitive fishes had lungs that eventually evolved into the lungs of terrestrial organisms and the gas bladders of modern fishes who use gills,not lungs,for oxygen/ carbon dioxide gas exchange.This is an example of
A) adaptive radiation.
B) exaptation.
C) sympatric speciation.
D) allopatric speciation.
E) temporal isolation.

Question

Quizplus · Accepted Answer

This is an example of exaptation because the primitive lungs were originally used for buoyancy control in water, but over time they were modified and used for gas exchange on land.

In Early Evolutionary History,primitive Fishes Had Lungs That Eventually Evolved