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

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
The light-colored sand radiates heat very rapidly at night

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Environmental Science
A term biotype means

all individual with different phenotype
all individuals with different genotype
all individuals having same phenotype
all individuals having same genotype

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