Final answer:
Lactose tolerance is an example of human biological adaptation, where a genetic mutation allows most Europeans to metabolize lactose and drink milk. This adaptation provided an evolutionary advantage to lactose tolerant individuals, allowing them to consume dairy products as a valuable source of nutrients.
Step-by-step explanation:
Lactose tolerance is an example of human biological adaptation. Most adult mammals cannot drink milk due to the inability to produce lactase, an enzyme that metabolizes lactose. However, most Europeans can drink milk because they have a genetic mutation that makes them lactose tolerant. This adaptation provided an evolutionary advantage to lactose tolerant individuals, allowing them to consume dairy products as a valuable source of nutrients.