Well, the whole novel is basically told through these letters, so they are used to advance the plot an offer some sense of authenticity to an implausible story. Plus, it is a way for them to express their own feelings and thoughts about the whole thing.
Answer:
My own definition of communication is talking to others, or communicating with someone in a way.
Explanation:
1. Barry-if you could believe him-told us that he would help!
2. Math, science, and social studies are all subjects I enjoy.
3. The speakers-each spoke on a different subject-were superb.
4. The teacher would not change the due date to Friday at 10:00.
