The answer is the <span>esophagus</span>
Answer:
General requirements for naturalization are below. Be at least 18 years old at the time of filing Form N-400, Application for Naturalization. Be a permanent resident (have a “Green Card”) for at least 5 years. Show that you have lived for at least 3 months in the state or USCIS district where you apply.
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Answer:
To study ancient books.
Explanation:
By studying books that was written at that time is the only way the historian takes help and study the past because there is no other tools except the writings which helps the historian in order find out the daily life of ancient peoples. There are some people are present in every era who saved the specific characteristics of that time in the form of writing books in order to transfer the information to coming generations.