Lactase deficiency is more common in asian, native american, mediterranean and some african populations than it is among people with northern or western european ancestry. how would you explain why this is so? a. asian, native american, mediterranean, and some african populations suffer from lactase deficiency because they have low levels of lactose in their diet. b. although most mammals, including humans, are able to digest the milk sugar, lactose, after infancy, asian, native american, mediterranean, and some african populations lost this ability through mutations about 7000 years ago. c. asian, native american, mediterranean, and some african populations suffer from lactase deficiency because they have high levels of lactose in their diet. d. although most mammals, including humans, are not able to digest the milk sugar, lactose, after infancy, the ancestors of northern and western europeans relied on dairy products as an important part of their food supply. e. when other food sources were in low supply, mutations that allowed the expression of the enzyme lactase to persist past childhood conveyed an advantage to adults who were able to include dairy products in their diet.