Environmental Science
Which of the following is mainly responsible for the extinction of wild life

Hunting of flesh
Pollution of air and water
Destruction of Habitats
All of these

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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:

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

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