World Geography
The polar regions of earth cannot support forest growth because

All of these factors
the rainfall is very low
the growing season is short in these areas
the ground is often frozen or snow or ice covered

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

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

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World Geography
The temperature inversion is

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

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