A.Includes a brief summary of each sources content and focus
Imperative is when you are giving a command
Interrogative is when you are asking a question
Declarative is when you are declaring something
Exclamatory shows a form of expression
Answer: Part A: D They separated into different groups long ago.
Part B: The answer is: "it also seems like they didn't mix much with outside groups until the arrival of Europeans in the seventh century"
Explanation: I took the test hope this helps!
It creates an organized structure that allows Kennedy to counter the opinions of others.