Which of the following have both internal and external digestion?
Correct answer: D. All of these
- A. Hydra
- B. Jellyfish
- C. Flatworms
- D. All of these
Explanation
Internal digestion occurs when food is digested within the body of the organism while external digestion is when an organism secretes digestive enzymes outside its body to digest food material and then absorb the digestive nutrients. Hydra, jellyfish, and flatworms all show a combination of these methods where they secrete enzymes, ingest partially digested food then internally digest the remaining.
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About Digestion
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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