Environmental Science
A high density of elephant population in an area can result in

Intraspecific competition
Interspecific competition
mutualism
Predation on one another

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

There is less oxygen in the air at high altitude
The temperature of the boiling water decreases with increasing altitude
Water boils at a higher temperature with higher altitude
Saturation vapor pressure decreases with increasing altitude

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

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

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