Environmental Science
Which of the following regarding ecological pyramids is not correct?

The pyramid of energy expresses mainly the rate of food production
In tree dominated ecosystem the pyramid of numbers is inverted
In deep water ecosystem, the pyramid of biomass is upright
The total energy flow at successive tropical level always decreases
In most ecosystems, the pyramid of numbers and biomass are up right

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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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