Read these two excerpts from the selection. Based on the text, the idea of an “evolutionary life raft” helps explain how
A one version of a gene permanently disappears from the genetic pool.
B changes in the environment caused the extinction of peppered moths.
C the dark peppered moth was able to make a comeback.
D clean-air laws put pressure on the white peppered moth.
The correct answer is C the dark peppered moth was able to make a comeback.
Explanation: The idea of an “evolutionary life raft” suggests that certain traits can help some organisms survive and thrive following environmental changes. In the case of the dark peppered moth, the genetic variation that allowed it to blend in with the soot-darkened trees due to industrial pollution had given it an advantage. As air quality improved and the trees became lighter, those moths were able to survive better and increase in number, essentially making a comeback thanks to their advantageous traits.
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