Question

In Platyhelminthes, digestive system is incomplete because

Answer 1

$\text{Incomplete digestive system}$

In an incomplete digestive system, there is only one opening, for both intake and elimination of food. Thus that opening serves both as mouth and anus.
Since platyhelminthes have a single opening for intake of food and egestion of wastes, hence, they are said to have an incomplete digestive system.


$\text{Final answer}$

c. it has only one opening that serves as both mouth and anus