Which statement best describes the three chambers of the heart

What is the central idea of this excerpt?

What is written in the preamble to the constitution? a. a list of reasons why the constitution was written b. the consequences of and penalties for ignoring the constitution c. a list of new laws added to the constitution accompanied by detailed explanations d. a guide explaining how to interpret and navigate the constitution

"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