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What is a result of natural selection?

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What is a result of natural selection? 

A. Dogs that are friendly to humans 

B. Grapes that contain no seeds 

C. Mosquitoes that are resistant to insecticides 

D. Onion crops that have a pleasant taste

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It is a general observation that when wee starts using insecticides against mosquitoes, initially their population diminishes but later on they become resistant to it and there is no effect of those chemicals on them. It is because of Natural selection in which the resistant mosquitoes are selected by nature & thus are able to produce more progenies.

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