Environmental Science
Which of the following is false?

Rate of succession is faster in secondary succession
Phytoplanktons are the pioneers in the aquatic ecosystem
The succession that occurs in newly cooled lava is called primary succession
The energy content in a trophic level is determined is determined by considering a few individuals of a species in that trophic level.
Quantity of biomass in a trophic level at a particular period is called as standing crop

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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:

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

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