During the Era, humans left the continent of and spread across the globe. They were , which means they moved from place to place in search of food. They survived by tracking game and collecting plants and berries, a practice called .

People who move from place to place in search of food are called nomads. The sentence directly defines the missing word this way, so “nomads” is the correct choice. Homo sapiens and hominids refer to groups or types of humans, not a way of life.

AI-written and checked against the verified answer.