Discuss the evolution of animals from choanoflagellate. Discuss different methods of feeding and digestion attributed to animal which can be determined by anatomical mouth parts. View diagrams of hydra. Discuss intracellular and extracellular digestion and the development of specific cavities and digestive tracts. Discuss and view exoskeleton and endoskeleton structures. View images of organisms with exoskeletons. Discuss endoskeleton chemical composition, calcium carbonate, cartilage, and bone. Determine the functions of the skeleton. Introduce the habitats of animals determined by a variety of adaptations. Briefly discuss animal cell structure and tissue development.