Which of the following is an incorrect statement? A. Gastrovascular cavities have a single opening through which animals both ingest food and expel wastes. B. Extracellular digestion is the process in which food is broken down outside cells in a digestive system. C. Intracellular digestion happens when animals digest food inside specialized cells that pass nutrients to other cells by diffusion. D. Digestive tracts have 2 openings, which allows food to move in 2 directions.