Environmental Science
Industrial melanism is an example of

darkening of skin due to industries
defensive adaptation of skin against UV radiations
drug resistance
protective resemblance with the surrounding

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Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

Circulation of heat by the atmosphere and oceans
Conduction of heat through the interior of the earth
Release of latent heat to the atmosphere when polar ice melts
Concentration of earth's magnetic field lines at the poles
The insulating properties of snow

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