Teacher wonders out loud what killifishes eat in water and asks students what they think. Teacher asks students to express their ideas or opinions about a scientific phenomenon or principle. To help students review what they have learned in previous lessons. To help students clarify their thinking or express it in a concrete way, through writing or drawing. Teacher asks students to visualize and draw the change in the air in a closed jar when a candle extinguishes.
Students discuss what to observe.
Plan investigations Students, assisted by teacher, generate hypotheses or predictions about the topic of study and define methods for investigation. To help students define a problem to investigate. To help students pose a problem in a systematic manner. To help students identify factors affecting a scientific phenomenon. To evaluate students' understanding and their insight into a scientific phenomenon Teacher asks students a series of questions to help them notice possible relationships among factors affecting levers.