2) nomad. The Columbia Encyclopedia, Sixth Edition. 2001 ...Some authorities prefer the terms "nonsedentary" or "migratory" rather than "nomadic" to describe mobile hunter-gatherers.) Wandering herders living in tents still...
3) agriculture. The Columbia Encyclopedia, Sixth Edition. 2001 ...The primary aim of agriculture is to cause the land to produce more abundantly and at the same time to protect it from deterioration and misuse. The diverse branches...