Answer:
Evolution and Natural change.
Explanation:
Answer:
<h2>Labor unions. In 1883, " The railroad industry" was responsible for creating the first system of time zones in the United States. This answer has been confirmed as correct and helpful.</h2>
Explanation:
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Answer:Smallpox and vaccination are intimately connected. Edward Jenner developed the first vaccine to prevent smallpox infections, and this success led to the global eradication of smallpox and the development of many more life-saving vaccines.
Explanation:
