The Osmoregulatory/excretory System of an Earthworm is Based on the Operation

Question

The osmoregulatory/excretory system of an earthworm is based on the operation of
A)protonephridia.
B)metanephridia.
C)Malpighian tubules.
D)nephrons.
E)ananephredia.

Accepted Answer

Earthworms have a series of metanephridia, which work to collect waste from coelomic fluid and release it through pores on the body surface. Metanephridia act as both osmoregulatory and excretory organs, making them the best choice for this question.