Which of the following is an acoelomate animal with a protandrous nature?

What is observed in Platyhelminthes,in contrast to Annelida?

The excretory unit found in the phylum $Platyhelminthes$ is: .........

Which one of the following kinds of animals are triploblastic?

“Triploblastic,unsegmented,acoelomate exhibiting bilateral symmetry and reproducing both asexually and sexually with parasitic forms.” The above description is characteristic of which phylum?

Which of the following is the common excretory organ in Platyhelminthes?