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‏سرد و قطبي
Polar climate
2.Introduction
Humans, unlike other species, consciously manipulate their environment.
In the distant past, the struggle against nature was primarily for survival. Protection from natural enemies was probably more important than shelter from the elements.
He forced to go where game was to be found. This precluded the use of permanent shelters other natural caves, but did permit the use of fire and development of clothing and such form of shelter as could be dismantled for transport and improvised from materials available at the new site.

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