What are the disadvantages of a flatworms digestive system having

The provided question is incomplete, however the complete question is as follows:

What are the disadvantages of a flatworm's digestive system having only one opening?

Answer:

The correct answer is - cannot consume food continuously.

Explanation:

The main disadvantage of digestive system in the flatworm are one way of opening which is a characteristic feature of many Platyhelminthes phylum organism. This type of digestive system where food enters and exits with the same and only opening available.

In flatworms, once the organism take the food it has to wait for the food to be digested and excreted out by the same opening it use to eat and leave the same opening.

Thus, the correct answer is - cannot consume food continuously.

The question is incomplete. The complete question is as follows:

What are the disadvantages of a flatworm's digestive system having only one opening?

Answer:

The digestive system of the flatworms has been modified depending on their host parasite interaction. They have simple digestive system with the single opening.

This digestive system might have some disadvantages as the food consumption is not continuous due to the single opening. The ingestion and excretion as same opening and this increases the timing of the digestion and excretion process. The energy is expanded more in this type of the digestive system.