Cestodes are distinguished from other flatworms by the absence of

Bilateral symmetry and acoelomate body organization are exhibited by which of the following?

Identify the given animal and its habitat.

Flame cells are the characteristic feature of which phylum?

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:

Which specialised cells are present for excretion in the phylum $Platyhelminthes$?