Environmental Science
Industrial melanism is an example of

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

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Environmental Science
Which of the following statements is not correct?

A change in the air temperature can change the relative humidity.
During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.
The length of human hair changes as the relative humidity changes.
The relative humidity is a measure of the air's actual water vapor content.

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