Answer:
Symbols are often used to emphasize a important theme in the book.
Explanation:
In To Kill A Mockingbird, the mockingbird symbolizes that a lot of things that are harmless are killed for no reason.
The Americans and Allies!
The first one and the third one both look like good answers. But if I had to choose one, I would go with Piston because its talking about technology. The piston is part of an engine so it would have to do with technology. :)
