Thousands of years ago, some people began dairy farming. This coincided with a number of mutations in a particular gene that resulted in these people developing the ability to digest dairy milk.
Based on the given passage, which of the following can be inferred?
All human beings can digest dairy milk.
No human being can digest dairy milk.
Digestion of dairy milk is essential for human beings.
In human beings, digestion of dairy milk resulted from a mutated gene.
Correct answer: (D) In human beings, digestion of dairy milk resulted from a mutated gene.
Explanation
The passage says that the ability to digest milk developed along with mutations in a gene, so the ability came from a mutated gene. It does not say that all human beings can digest milk, that none can, or that digesting milk is essential.
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