Mr. Devereaux's students were in science lab trying to identify biomolecules: carbohydrates, fats and proteins. During the lab experience, Assistant Principal Haskins came in to evaluate the teacher and the learning environment. Ms. Haskins reacted positively to the fact that the students were conducting a hands-in investigation, but she reacted negatively to the overall classroom environment. Take a look at one lab group. Justify Ms. Haskins' concern. What procedures should Mr. Devereaux have followed before the lab began?