What type of punctuation mark is used to set off words that add detalis in the middle of a sentence?

The excerpt is from a longer essay on huckleberry finn by mark twain. what kind of support is used to develop the writer's main idea regarding how twain brought his characters to life?

Which word is an example of an iamb mother underneath heartbreak today

"as joseph sat in history class, he was aware that the teacher was talking, but instead of paying attention, he doodled in his notebook." this is an example of a. listening b. hearing c. talking d. understanding