while some nomadic peoples are hunter-gatherers, most nomadic groups do not survive by foraging for food and eating wild plants and animals. The term “nomad” itself actually derives from Greek word “nomos”, meaning pasture, and as this name indicates, nomadic people mostly practice a form of agriculture. They roam the countryside searching for new regions to exploit. Nomadic pastoralism was common millennia ago, and it is still practiced by people in many countries today. This lifestyle is perhaps most prevalent in Iran, where there are over a million of nomadic people. Comprised of a variety of different tribes, Iranian nomadic people mainly raise cattle, sheep and goats. These groups trek across the country in seasonal migrations, taking their livestock with them from the warm plains to cool mountain pastures in summer. Although arduous, this journey is essential to ensure the survival and productivity of their agriculture. Why does the author explain the Greek origin of the term “nomad”?