Mrs. thomas is a new fourth grade teacher. in the third week of school, she is introducing a new science unit that includes several words that will probably be new to most of the students. the unit involves extensive declarative knowledge, and mrs. thomas has chunked the information into small segments that her students can grasp. now she is in the classroom and ready to begin the introduction with the students. what is the first thing she must do in order to meet her goal of students learn?