Early humans lived as nomads, because they did not have a stable food source with which to live.

Why the life of early humans were nomadic?

Early humans lead a nomadic life as they moved from place to place in search of food and water. They did this because the animals on which they were dependent for food moved to distant places.

What era were humans nomads?

For the roughly 190,000 years of human existence prior to that, within the period called the Paleolithic (Old Stone Age), all human societies were nomadic.