Answer:
Because the human body is below 40degrees Celsius which is the optimal temperature of the lactace enzyme.
At the optimal or average body temperature of the body the human body, the nature of the lactase protein is not denatured.
Explanation: Lactase enzyme is produced in the cells of the small intestine of humans and most mammals,the main function of the Lactase enzyme is to ensure the digestion of sugars that are present in the milk and other dairy products consumed by both humans and other mammals.
The optimal temperature of the lactase enzyme is 40degrees Celsius which means it can successfully fulfill and perform its functions within the human body whose temperature is generally below 40degrees Celsius.
