Environmental Science
Mycorrhiza represents

Parasitic association between a fungus and an alga
Symbiotic association between a fungus and roots of higher plants
Symbiotic association between a fungus and liverworts
Parasitic association between a fungus and roots of plants

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

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