Question
Differentiate between complete and incomplete digestive systems.

Answer

 
Complete Digestive System
Incomplete Digestive System
1.
When the digestive system has two openings, the mouth for ingestion and the anus for egestion, the digestive system is said to be complete.
e.g. human beings.
When the digestive system has only one opening for both ingestion and egestion, the digestive system is said to be incomplete.
e.g. Hydra.

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