Environmental Science
Industrial melanism is an example of

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

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Environmental Science
The earth's radiative equilibrium temperature is:

The temperature at which the earth is radiating energy at maximum intensity
The temperature at which rates of evaporation and condensation on the earth are in balance
The average temperature the earth must maintain to prevent the oceans from freezing solid
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates

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