Refer to your Expeditions in Reading book for a complete version of this text. How does the author help readers better understand pasteurization?

The sentence, “Dr. Louis Pasteur found a way to vaccinate them, and so to keep them healthy” explains the process.

The sentence, “Many people became ill and died from drinking the milk of sick cows” describes the problem.

The phrase, “a method of making milk safe” defines the word.

The phrase, “so to keep them healthy” restates the meaning.