The first animal phylum to exhibit a triploblastic body organization is .........

The study of worms which cause parasitic infestations in humans is called:

In the life history of the liver fluke,the following stages are present: $(1)$ Cercaria,$(2)$ Metacercaria,$(3)$ Sporocyst,$(4)$ Redia,$(5)$ Miracidium. What is their proper sequence?

Which of the following does not belong to phylum-Platyhelminthes?

High regeneration capacity is possessed by

The gut is present in all of the following taxonomic groups of Platyhelminthes,except for one. Identify the group in which it is absent.