What difficulties did primitive people experience?

To deal with difficulties, primitive people united in herds. During the Ice Age, to protect from the cold, people sewed clothes from the skins of killed animals and took refuge in caves from the weather. There was also a struggle between humans and predators. In order not to die of hunger, people are forced to collect roots, fruits, mushrooms. If poor-quality and poisonous food came across, people died. The life expectancy of ancient people was significantly reduced due to the difficulties of fighting nature and diseases.