Distinguish between the following (a) Prostomium and peristomium (b) Septal nephridium and pharyngeal nephridium

(a) Prostomium and peristomium
Prostomium:-Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function.
Peristomium:-The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening.

(b) Septal nephridium and pharyngeal nephridium
Septal nephridium:-They are present on both sides of intersegmental septa behind the 15th segment. They open into the intestines.
Pharyngeal nephridium:- They are present as three paired tufts in the fourth, fifth, and sixth segments.

For more answers visit to website:
https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-7/