21. Evolution by Natural Selection
Descent with Modification
1:53 minutes
Problem 7b
Textbook Question
Textbook QuestionA swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from the air-breathing organ (a simple lung) of an ancestral fish is an example of a. exaptation. b. changes in Hox gene expression. c. paedomorphosis. d. adaptive radiation.
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