Which of the following is not a protozoan?

Which of the following organisms is a pseudocoelomate?

Which animal phylum possesses a mouth at the anterior end and an anus at the posterior end?

Which one of the following is a pseudocoelomate?

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.

Enterobius infection occurs through