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Answer:
Scientists believe that the earliest hominids may have used caves as shelters. They probably ate vegetables and gathered seeds, fruits, nuts and other edible plants. Later, scientists speculate, meat was added to the diet as small animals were hunted. Eventually, humans hunted large animals.
In order to hunt successfully, early men had to work together. As humans became successful hunters, they migrated over great distances in search of food. For nearly a million years, however, periods of extremely cold weather during the Ice Age limited the areas to which early people could migrate. Prehistoric people learned how to use fire and make warm clothing in response to this cold climate.