During periods of extreme drought, the South American lungfish is able to escape

Question

During periods of extreme drought, the South American lungfish is able to escape drying out by borrowing into the fresh mud and waiting for the wet season to come again. In hot summers, the water and mud dries too quickly for all of the lungfish to burrow themselves in safety, resulting in population mortality as high as 40%. An examination of species closely related and ancestral to the South American lungfish that inhabit regions without extreme dry seasons shows that they use the end of the rainy season as a signal to begin burrowing. Which of the following statements is most strongly supported by this observation? Answer Mud burrowing in the South American lungfish is an example of pre-adaptation. Mud burrowing in the South American lungfish is neither an adaptation nor a pre-adaptation. Mud burrowing in the South American lungfish is both an adaptation and a pre-adaptation. Mud burrowing in the South American lungfish is an example of adaptation.

Explanation / Answer

Mud burrowing in the South American lungfish is an example of adaptation.

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