World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

None of these
ultraviolet rays from the sun
infrared rays from the sun
the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun

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

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