Environmental Science
Typically, water vapour occupies about what percentage of the air's volume near the earth's surface?

About 78 percent
About 21 percent
Close to 10 percent
None of these
Less than 4 percent

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

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

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