World Geography
The temperature inversion is

All of these
whenever the normal decrease of atmospheric temperature or moisture or both change with height over
when the decrease in temperature or moisture or both takes place
whenever the normal decrease of atmospheric temperature

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World Geography
The term 'flora' in the context of natural vegetation refers to

role played by species of animals in the maintenance of ecological balance
plants of a particular region or period, listed by species and considered as a group
assemblage of plant species living in association with each other in a given environmental frame
a large tract covered by trees and shrubs and its administration for assessing economic benefits

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