Female $Ascaris$ differs from the male in

Enterobius infection occurs through

Choose the correct option for characters of roundworm.
$(I)$ Body is circular in cross-section.
$(II)$ Parasite found in animals and plants.
$(III)$ Organ-system level of body organization.
$(IV)$ Incomplete digestive system.

In $Ascaris$ (roundworm),excretion occurs through which of the following?

$A$ true coelom is absent in which phylum?

Male $Ascaris$ is differentiable from female $Ascaris$ in: