Fill in the blank. By controlling , early humans were able to eat a more varied, nutritious diet.

fire

hierarchy

radiometric dating

Beringia

disease

dog

Agriculture provided a stable food source and encouraged population growth, which allowed for the development of settlements which would become towns and later cities. However, the settled diet wasn't as varied as a hunter-gatherer diet and the dense settlements allowed diseases to spread easily. As populations and wealth grew in settled communities, hierarchies and classes were established. Warfare also intensified.

Humans first successfully migrated into the west of Asia about 70,000 years ago, and by 50,000 years ago had migrated to Eastern Asia and Australia. About 40,000 years ago, humans first migrated to Europe. The last areas to be reached were the Americas, through the Beringia land bridge about 15,000 years ago. As they migrated, humans impacted the environment and become the top predators. Many scientists believe that humans were a main factor for the extinction of Pleistocene megafauna.

Explanation: Penn foster