Is a "photograph album containing pictures of classmates at tuskegee institute in 1923" a primary source?

If a certain person was in the photographed and showed you it, that would be considered a primary source because the person is showing you are photograph of him and his classmates. If the photograph is in a textbook or was shown by someone else talking about those classmates, then that would be considered a secondary source because they were passed down that image. I'm assuming you were shown this photograph in a textbook or by a teacher, so I'm willing to assume that the source would be secondary.

answer; repetitive thoughts; ritualistic behaviors;

an important point to remember about correlation is that while there is a _statistical_ relationship correlation does not equal _causation_

the first answer is: statistical

the second answer is: causation