Which statement best describes the difference between primary source documents and secondary source documents? - Primary source documents are always nonfiction pieces while secondary sources are sometimes fictional.
- Primary source documents, unlike secondary sources, include multiple quotations as well as summaries and paraphrasing.
- Primary source documents discuss U. S. historical events while secondary sources focus on International events.
- Primary source documents, unlike secondary sources, are written by someone who experienced or observed an event.

Primary sources can be described as those sources that are closest to the origin of the information. They contain raw information and thus, must be interpreted by researchers. Secondary sources are closely related to primary sources and often interpret them. These sources are documents that relate to information that originated elsewhere.

Explanation:

this is a good question! i'll do some research and come back when i have the answer!

the gas pressure p, gas volume v, and gas temperature t are given in the formula:   pv=nrt,

r is the gas constant, and n is the number of gas moles.

if the container is cooled and remains under atmospheric pressure, where r is a constant that does not change, the volume of the container remains the same, the conclusion is drawn that, with all other values ​​unchanged, the number of gas moles n, is decreases.

the right answer is a.