The Density of Occupation of the World Made Possible by Trade This ‘chain reaction’ sparked by new settlement and trade may be studied more closely. While some animals are adapted to particular and rather limited environmental ‘niches’ outside of which they can hardly exist, men and a few other animals such as rats have been able to adapt themselves almost everywhere on the surface of the earth. This is hardly due merely to adaptations by individuals. Only a few and relatively small localities would have provided small bands of hunters and gatherers all that even the most primitive tool-using
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