A changing climate forced people to migrate from cold northern locations to more temperate regions.
The answer is poor cause they are not going to give very high quality to them
an overt act of aggression on the right of property in slaves : the South urged to adopt concerted action for future safety,
It was a recource that could be traded throughout other places and used as a currency
The correct answer is "It's a primary source because it's firsthand information".
When we're presented with a statistical study of a certain topic, we're dealing with hard facts. A statement addressing "Percentage of College Degrees Awarded to Women" isn't making any assumptions on the matter and the tone of the phrase is neutral as opposed to personal (like you would find in a diary for example). Also, it's not an opinion that someone is giving through speech, but rather the expression of a mathematical calculation that someone made through the observation of certain data firsthand. That's why it is a primary source.
Hope this is helpful!
