Elimination of ammonia as the body waste in Cnidaria takes place by
Nephridium
Protonephridium
Gills
Body surface
Physiology of Cnidaria -
Excretion in Cnidaria:
-
The excretory system is absent in cnidaria. The nitrogenous waste, which is mainly
composed of ammonia, is removed through the process of diffusion between the cells and
water.