World Geography
The hunting and gathering economy can support only

3 persons per sq. km
7 persons per sq. km
5 persons per sq. km
1 person per sq. km

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World Geography
The sidereal month may be defined as

the period of rotation of moon
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky
the period in which the moon completes an orbit around the earth
None of these

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