Evolutionary change is gradual. However, the genetic influence of the lactase enzyme has shown that
A) culture and genetic adaptations have influenced one another.
B) lactose intolerance is not genetic nor cultural.
C) Europeans tend to be most lactose intolerant.
D) Asians have included increasing amounts of milk in their diet.
Answer: A
Rationale: Evidence from studies show that as cultures began to domesticate livestock that produce milk, there was a rise in the digestive enzyme lactase.
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