World Geography
The variation in the duration of the day and the night is due to earth's

inclination of an angle of 601/2 degrees
both (a) and (b)
rotation on its axis
revolution around the sun

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World Geography
What is the opportunities provided by a country’s demographics in which the working population is much more than the dependent population called?

Age structure composition
Demographic Gap
Demographic Dividend
Real population Density

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