The osmoregulatory/excretory system of a freshwater flatworm is based on the operation of ________.
A) protonephridia
B) metanephridia
C) Malpighian tubules
D) nephrons

Question

Quizplus · Accepted Answer

Freshwater flatworms use protonephridia as their excretory system. These are small, flame-like structures that help remove excess water and waste from the flatworm's body. Metanephridia are found in some annelids, Malpighian tubules are used by insects and some other invertebrates, and nephrons are the functional units of the vertebrate kidney.

The Osmoregulatory/excretory System of a Freshwater Flatworm Is Based on the Operation