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

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
Dry air is a very poor heat conductor
Free convection cells are unable to form above the hot desert ground
The ozone content of desert air is very low

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Environmental Science
Which one is true?

commensalism when the interaction is useful to both the populations
commensalism when none of the interacting populations affect each other
symbiosis when the interaction is useful to both the populations
symbiosis when neither population affects each other

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