Answer:
Cheese which is gotten from milk helped ancient humans with lactose tolerance survive times of famine when milk was more available than other foods. It also helped them to pass the gene to their descendants who also became lactose tolerant.
Explanation:
Cheese and other dairy products were consumed in limited quantities by ancient humans because many of them were lactose intolerant. Lactose intolerance occurs when adults stop producing the enzyme needed to digest milk. Then, if a Lactose intolerant person consumes milk, he would become very sick and sometimes die.
When some ancient humans had mutations in their genes that made them become lactose tolerant, they were then able to consume milk and cheese even in times when food was scarce. They also passed this same ability to their descendants who also became lactose tolerant and so would not die or fall ill if they consumed cheese or other dairy products.
