Mainsprings of Civilization |
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according activity agriculture American animals appears average become biological cause cent century cities civilization climate close cold contrast countries crops cultural curve cycle diet early effect electrical England environment especially evidence example extreme fact factor Figure followed give groups hand human idea important increase India indicate influence Italy kind kiths land lead least less living lower maximum means mental migration months mountains names natural Nevertheless nomads North occur ozone period persons physical population practically present probably production progress qualities race regions relation relatively result rise says season seems seen selection shows similar social South southern stimulating storms strong summer temperature tend tion tropical United varies vigor warm weather whole widely winter York