The following were the main determining factors behind early human behavior. -- - glaciers and gathering fruit and nuts - temperature and hunting tools - environmental factors and food supply - climate change and drought

The correct answer is C) environmental factors and food supply.

The following were the main determining factors behind early human behavior: environmental factors and food supply.

The first humans depended so much on the weather, the environment, food, and shelter to survive. They used to be nomads, gather-hunters, that followed animal herds to hunt them and feed their families. During the Neolithic Revolution, humans started to learn agriculture techniques that allowed them to settle in one place and grow crops and later, founding towns and cities. That was the case -for instance- of the Sumerians, the ancient human civilization. They settled between the Tigres and Euphrates Rivers in what today is Iraq and founded many city-states such as Uruk, Ur, and Lagash.

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