Description In Science Comics: The Digestive System , visit the inside of your mouth, stomach, liver, intestines, and other organs that make up the gastrointestinal tract! Your guide to the gut is a friendly bacterium who will take you on a journey beyond imagination. Uncover how food is transformed into nutrients! Explore strange and dangerous glands! Behold the wonders of saliva, mucus, and vomit! Writer Jason Viola and illustrator Andy Ristaino provide a trip to the toilet you will never forget! Every volume of Science Comics offers a complete introduction to a particular topic.dinosaurs, the solar system, volcanoes, bats, robots, and more! Whether you're a fourth grader doing a natural science unit at school or a thirty-year-old with a secret passion for airplanes, these graphic novels are for you!