This document discusses the digestive system in ruminants and different types of digestion and respiratory systems in animals. It describes ruminants having a multi-chambered stomach containing bacteria to break down plant matter. It outlines two main types of digestion - intracellular digestion occurring within cells and extracellular digestion occurring in cavities or tubes. It provides examples of sac-like digestive plans in hydra and flatworms and tube-within-a-tube systems in worms and humans. It also briefly covers different respiratory systems from diffusion to cutaneous, branchial, tracheal, and pulmonary respiration.
