Environmental Science
Which of the following statement is incorrect regarding ecological pyramids

The pyramid of biomass is inverted in aquatic ecosystem
The pyramid of biomass is upright in grass land ecosystem
The pyramid of energy is inverted in ocean ecosystem
The pyramid of numbers is upright in grass land ecosystem

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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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