''he mockingbird, the mad dog, and the tree by the Radley House are important symbols that are within the novel. The Mockingbird symbolizes innocence, so the title suggests that innocence is being killed or destroyed. There are many examples of mockingbirds in the novel, which is why this symbol is the most significant
I believe that it is purpose. It is not theme nor pathos. I do not think that it is thesis because this paragraph states the thesis of the Deceleration of Independence. Hope this Helps!
