Intracellular digestion
Digestion without a digestive tract
Animals with extracellular digestion
Incomplete digestive system
Extracellular digestion
Animals with intracellular digestion
Complete digestive system
Refers to nutrient processing and absorption that occurs inside of cells. It occurs in animals without digestive system
Refers to the breaking down of materials into smaller, absorbable components that takes place outside the cell. It occurs in animals with digestive system.
Consists of a digestive tract with two openings. One opening is the mouth. The other is the anus. Most of animals have this type of digestion.
Food items are brought into the cell for digestion. Sponges have this type of digestion.
planarian arthropoda mollusks annelids
porifera
Consists of a digestive cavity with one opening. The single opening serves as both mouth and anus. Cnidaria and platyhelminthes have this type of digestion.