Which of the following is an example of artificial selection?
A. Cichlids have diversified into nearly 200 species in Lake Tanganyika.
B. Thoroughbred racehorses have been bred for speed.
C. Whales have evolved tails that help propel them through water.
D. Darwin's finches have beaks adapted to eating different foods.
E. Ostriches have lost the ability to fly.
Answer: B
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