Some green beetles appear among the red beetle because

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Beetles change colour from red to green with change of season.

Natural variations occur during sexual reproduction.

Red beetles mimic green colour of leaves whenever they see crows.

Beetles become green by accumulating chlorophyll from the green leaves that they eat.

answer is D.

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Detailed Solution

Green beetles appear among the red beetle because natural variations happen during sexual reproduction. Genetic variation is necessary because it helps populations change over time.
Variations which help an organism survive and reproduce are moved on to the next generation and it hinder survival and reproduction are eliminated from the population.
This process of natural selection may lead to significant changes in the appearance, behavior, or physiology of individuals in a population, in just a few generations.
Once new alleles arise, meiosis and sexual reproduction mix and make different alleles in new ways to increase genetic variation.

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