Which of the following groups of animals are bilaterally symmetrical and triploblastic?

Number of juvenile stages found during the development of $Ascaris$.

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.

While trying to find out the characteristics of a newly found animal,a researcher performed histology on the adult animal and observed a cavity with the presence of mesodermal tissue towards the body wall,but no mesodermal tissue was observed towards the alimentary canal. What could be the possible coelom of that animal?

Larvae of $Ascaris$ hatch out in

Which of the following characteristics is present in $Ascaris$?