World Geography
The most densely populated regions in the world are

the equatorial regions
the hot desert climatic regions
the summer climatic regions
the monsoon climatic regions

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

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

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