The filariform larva is a characteristic developmental stage of which phylum?

The body cavity formed from the blastocoel is known as ...........

Pseudocoelom develops from

Sexual dimorphism is found in

Which of the following statements are correct about the life cycle of $Ascaris \; lumbricoides$?
$(A)$. Infective agent - Embryonated egg with $II$ Juvenile
$(B)$. Fertilised eggs containing the unsegmented ovum are passed with faeces
$(C)$. Four moultings of the larva occur: two outside in soil within the egg-shell, one in lungs and one in intestine
$(D)$. Site of location of worm - small intestine.

The scientific name of pin worm or seat worm is