Final answer:
The Paleolithic Era is known for its nomadic groups and hunters/gatherers, where societies relied on hunting wild animals and gathering plants for food.
Step-by-step explanation:
The era known for its nomadic groups and hunters/gatherers is the Paleolithic Era. During this time, human societies were primarily hunter-gatherers, relying on hunting wild animals and gathering edible plants for sustenance. Their diets were diverse and included food sources such as wild grains, berries, honey, small and large mammals, fish, and shellfish. The technology of this era included knapped stone tools and the development of significant innovations like the use of fire and language. Over time, as societies evolved, the Neolithic Revolution marked a shift to agriculture, but this came after the Paleolithic Era where nomadic hunting and gathering were the predominant ways of life.