Environmental Science
The most important human activity, leading to the extinction of wildlife, is

Pollution of wildlife, is
Alternation and destruction of the natural habitats
Introduction of alien species
Hunting for valuable wildlife products

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Environmental Science
In a temperature inversion:

Air temperature decreases with increasing height
It is warmer at night than during the day
Air temperature increases with increasing height
Air temperature remains constant with increasing height

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Environmental Science
During an equinox:

All of these
The days and nights are of equal length except at the poles
The earth is not tilted toward nor away from the sun
At noon the sun is overhead at the equator

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of visible light by the ground
Absorption and re-emission of visible light by clouds
Absorption and re-emission of ultraviolet radiation by the atmosphere
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of infrared radiation by the atmosphere

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