Selina had just begun to head her paper when Lafay had opened the floor to the answer to her question. The room began to scuffle with the excitement of everyone's answers. Selina rose her hand and said, "Ma'am, a poison is a substance that is harmful to a vital part of the human body. These substances can be found in nature and when if taken in a high enough dosage can be fatal. Of course they do not have to be."