What is the functions ofnephridia?

Answer the following
(i) What is the functions ofnephridia?
(ii) How many types ofnephridia are found in earthworm based on their location?

(i) Nephridia are the organs of excretion and osmoregulation in earthworms and other
(ii) Three types of nephridia are, i.e., pharyngeal nephridia (in segments 4 to 6), septal nephridia anterior and posterior surfaces of all the septa behind the segment 15 and integumentary nephridia attached to inner body surface of all segments except the first two.