The fact that people from some cultures lack an enzyme to allow them to digest milk reflects that

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The fact that people from some cultures lack an enzyme to digest milk is an example of how culture can influence human evolution. Certain cultural practices, such as the domestication of dairy animals, have led to genetic adaptations in some populations, while other populations have not been exposed to such practices and have not evolved the ability to digest milk.

The Fact That People from Some Cultures Lack an Enzyme