The document provides information about snakes through multiple paragraphs. It discusses snakes' internal and external transportation methods, as well as their internal fertilization, nutrient intake, and responses to stimuli. The document also covers snakes' adaptations, respiration, regulation, background classification, role in the food chain, general body structure, and importance to human life. It concludes by listing some other reptiles in snakes' group and providing facts about poisonous snakes and the world's largest snake species.