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Q.

Cactuses have two sets of predators namely peccaries (a kind of pigs) which like to eat cactus fruits with fewer spines and parasitic insects which like cacti that have very dense spines to keep their own predators away. Successful cactuses have an average number of spines to help to escape from both of the organisms. This kind of natural selection is

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a

Diversifying selection

b

Artificial selection

c

Directional selection

d

Stabilizing selection

answer is D.

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Detailed Solution

As the natural selection led to maintain more individuals that acquired mean character value (here average number of spines), it is termed stabilizing selection.

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