In which phylum is the male smaller in size than the female?

Which of the following is a differentiating trait of $Ascaris$?

Which of the following is not a protozoan?

In animals of the phylum Aschelminthes,which layer is present in the form of scattered pouches?

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?

Female $Ascaris$ differs from the male in