What is true about $Taenia$ $saginata$?

What is observed in Platyhelminthes,in contrast to Annelida?

The animal given below has only one opening to the outside that serves as both mouth and anus:

$A$ metazoan covered by cilia is

Given below are two statements.
Statement $I$: Cephalic ganglion appears like $U$ shaped structure in Hydra.
Statement $II$: Ventral nerve cords are connected to each other by commissure in a ladder like manner in Planarian.
In the light of above statements,choose the most appropriate answer from the options given below:

Flame cells present in the members of Platyhelminthes are specialized to perform: