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

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

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Environmental Science
Which among the following is related to the word Mesoderm ?

Anatomically advanced animals having all three germ layers
No membrane-bound organelles, no peptidoglycan in cell walls, introns
Forms blood and bone (leads to complex internal organs)
Binomial system of classification

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