Which of the following animals is triploblastic?

The Miracidium larva occurs in the life history of:

Which of the following is an example of a digenetic Platyhelminthes?

True regeneration is found in

Which of the following does not have an alimentary canal?

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: