What do freshwater flatworms use to remove excess water from body fluids?

a. flame cells

b. nephridia

c. excretory pores

d. kidneys

The freshwater flatworm has A. Flame cells. Flame cells function like a kidney, removing waste through filtration. Cilia propel waste matter down the tubles and out of the body through a pore. Looking at a Flame cell through a microscope the cilia cluster looks like a flickering flame.