The osmoregulatory/excretory system of a freshwater flatworm is based on the operation of _____.
A) protonephridia
B) metanephridia
C) Malpighian tubules
D) nephrons
Answer: A
Biology Questions and Answers.
A) protonephridia
B) metanephridia
C) Malpighian tubules
D) nephrons
Answer: A