World Geography
The thickness of biosphere is

5-10 km above the earth's surface
5-8 km above the earth's surface
8-10 km above the earth's surface
10-12 km above the earth's surface

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

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
role played by species of animals in the maintenance of ecological balance

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