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Explain industrial melanism. |
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Answer» Two varieties of peppered moth were seen. Biston betularia grey coloured and Biston carbonaria black coloured. Before industrialization number of grey variety was more. After industrialization number of black variety increased. Due to pollution lichens disappeared and the tree became dark. The black variety got advantage through camouflage and were saved by the attack of predator birds. This showed natural selection of the black coloured moths. |
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