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

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

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Environmental Science
Definition of ecosystem is

A community of organisms interacting with one another
The part of the earth and its atmosphere which inhibits living organisms
The community of organisms together with the environment in which they live
The abiotic component of a habitat

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