World Geography
The ionosphere contains ionized air that protects the earth from

the ultraviolet rays of the sun
the infrared rays of the sun
None of these
the falling meteorites

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

assemblage of plant species living in association with each other in a given environmental frame
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
a large tract covered by trees and shrubs and its administration for assessing economic benefits

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