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.
