Which of the following is an incorrect statement? a. digestive tracts have 2 openings, which allows food to move in 2 directions.
b. gastrovascular cavities have a single opening through which animals both ingest food and expel wastes.
c. extracellular digestion is the process in which food is broken down outside cells in a digestive system.
d. intracellular digestion happens when animals digest food inside specialized cells that pass nutrients to other cells by diffusion.