The development of agriculture involves an intensification of the processes used to extract resources from the environment: more food, medicine, fiber, and other resources can be obtained from a given area of land by encouraging useful plant and animal species and discouraging others. As the productivity and predictability of local resources increased, the logistics of their procurement changed, particularly regarding the extent to which people were prepared to travel in order to take advantage of seasonally available items. Group composition eventually became more stable, mobility declined, and, as a consequence, populations increased. In terms of material culture, durable houses and ...(100 of 27491 words)