2) Irrigation helped early civilizations grow more food.
Explanation:
Civilizations are complex societies of cities, art, class, government, religion, writing system and division. over a thousand years, some of the early farming developed into civilizations.
The civilizations arose near the river valleys just because of the good and better farming conditions which help the civilizations to grow and reach its peak because the biggest issue of availability of food is over after the development of farming.
