World Geography
Which among the following principle is used by Bats?

law of reflection
RADAR (Radio Detective & Ranging
SONAR (Sound Navigation & Ranging
law of diffraction

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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
assemblage of plant species living in association with each other in a given environmental frame
role played by species of animals in the maintenance of ecological balance

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