Environmental Science
Definition of ecosystem is

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

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

Dry air is a very poor heat conductor
The ozone content of desert air is very low
The light-colored sand radiates heat very rapidly at night
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

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