Why are green beetles green ?

Dear student,   
Please find below the solution to the asked query   

Green beetles evolved from red beetles by natural selection. In natural selection, as more of red beetles were eaten by birds (crow), the population of red beetles decreased as compared to green beetles. Because crows cannot see green coloured beetles on the green leaves but they can see red ones.Hence, red beetles survived to reproduce less often than green beetles. So this helped green beetles to survive more and therefore they reproduced more as compared to red beetles and allowed the green beetles to have more offspring. 
Hence, green beetles are green due to evolution.

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