Environmental Science
What is edge species?

Rare species
Endemic species
Species on the verge of extinction
The species which occur abundantly in the ecotone

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

In most ecosystems, the pyramid of numbers and biomass are up right
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
The pyramid of energy expresses mainly the rate of food production

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Environmental Science
An important reason for the large daily temperature range over deserts is:

There is little water vapor in the air to absorb and re-radiate infrared radiation
Free convection cells are unable to form above the hot desert ground
The ozone content of desert air is very low
The light-colored sand radiates heat very rapidly at night
Dry air is a very poor heat conductor

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