effect of environment on

Traces the development of primitive societies showing why some groups advanced more rapidly than others and how this progression explains why various populations stabilize at specific phases of development while others continue to evolve.

Traces the development of primitive societies showing why some groups advanced more rapidly than others and how this progression explains why various populations stabilize at specific phases of development while others continue to evolve.

Photographs and text provide information about the people, creatures, and plants that live in both hot and cold deserts.

Introduces the harsh world of deserts and the people, plants, and animals that live there.