World Geography
The sequence of layers of atmosphere from earth to upwards is

troposphere, stratosphere, stratopause, mesosphere , ionosphere
troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, ionosphere(thermosphere, thermopause, exosphere)
troposphere, tropopause, stratosphere, thermosphere, exosphere
troposphere, tropopause, stratosphere, mesosphere , exosphere, thermosphere, thermopause

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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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