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

Question

Quizplus · Accepted Answer

The earthworm's osmoregulatory/excretory system operates based on metanephridia. These are segmented organs that function to filter between the coelomic fluid and the external environment to maintain the animal's water and ion balance. Each segment of an earthworm has a pair of metanephridia.

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