A source that came from the time period that the event happened in or came from a firsthand account of the event

A primary source is a first-hand or contemporary account of an event or topic. They are the most direct evidence of a time or event because they were created by people or things that were there at the time or event. These sources have not been modified by interpretation and offer original thought or new information.

Secondary sources are works that analyze, assess or interpret an historical event, era, or phenomenon, generally utilizing primary sources to do so. Secondary sources often offer a review or a critique. Secondary sources can include books, journal articles, speeches, reviews, research reports, and more.These are sources that index, abstract, organize, compile, or digest other sources. Some reference materials and textbooks are considered tertiary sources when their chief purpose is to list, summarize or simply repackage ideas or other information.

Explanation:

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answer: the ocean

explanation: if you map out 30 n and 40 n latitude, you will get the ocean

increase in population