Mehlis's glands of Tapeworm are associated with:

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?

In which phylum do animals have a digestive tract that opens at only one end?

The $Onchosphere$ larva occurs in:

In which triploblastic animals is the coelom absent?

The $Cercaria$ stage of $Fasciola$ $hepatica$ leads to which of the following stages?