Genes and phenotypic adaptation work together to produce a biochemical difference between human groups in the ability to digest large amounts of milk. This is an adaptive advantage when
A. lactase, the enzyme that breaks down lactose, is not produced in enough quantities to keep up with dietary intake.
B. mothers cannot wean their children from breast milk after they turn one year old.
C. other foods are scarce and milk is available, as it is in herding societies.
D. herding societies shift to a sedentary agricultural lifestyle.
E. there is not enough lactose in the diet.
Answer: C
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