Question

How many openings are in the digestive system of flatworms?

Answer 1

There is only one opening in the digestive system of flatworms.
This opening is also used for as a mouth. Mouth of the flatworms opens into gastrovascular cavity. Platyhelminthes is a Flatworms who uses mouth, pharynx and intestine for its digestive system. They have only one opening which is also their mouth, no anus, this makes their digestive track incomplete.

Answer 2

How many openings are in the digestive system of flatworms? Answer: 1

Flatworms digestive system is called 2-way which mean the same opening is used for eat and removing waste. That's why it only has one opening. Human system is one way since we eat from the mouth and remove waste from the anus.