hunting and gathering
The people hunted and gathered what was available.
Food we eat.
after the ice age was over early people either fished,gathered,or hunted for more simple animals
polar bears main source of food is fish, seabirds and sometimes reindeer
The Sun.
The Cheyenne's main food source is buffalo berry's.
Corn or maize was a primary food source.
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Yes, of course, cows and sheep use them as their main nourishment. We humans, however, can't use grass as food.
During the Paleolithic age, people were primarily hunter-gatherers. They hunted animals for food, made tools from stone, bone, and wood, and gathered plants and fruits for their sustenance. The main focus of their occupation was on survival and securing resources for their communities.
carbohydrates are our main source of energy
The source of wood is trees.