Schools use dissections in class so that the students can learn about the body of animals hands on. Text books can tell you about the inside of the animals, but only dissecting them do you actually learn about what is inside. It is proven that most people learn better with hands on activities, so dissecting an animal gets the students to pay more attention, and it’s just plain fun. i know from experience that I myself am a hands on learner, so dissection helps me to understand what the books can’t teach me.