Environmental Science
Industrial melanism is an example of

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

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

25% of the air molecules in the atmosphere
50% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere
10% of the air molecules in the atmosphere

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