The $Chloragogan$ cells of $Pheretima$ are analogous to which organ in humans?

Select the incorrect option for the earthworm $(Pheretima)$.

Identify the incorrect statements among the following:
$(a)$ In earthworm,a single male genital pore is present.
$(b)$ Setae help in locomotion of earthworm.
$(c)$ The muscular layer in the body wall of earthworm is made up of only circular muscles.
$(d)$ Typhlosole is a part of the intestine of earthworm.

Why is the nerve ring considered the brain of the earthworm?

Give a scientific reason: The blood vascular system of leeches is also called the haemocoelomic system.

The nephridiopore is the opening of $............$.