A) urea
B) protein
C) ammonia
D) amino acid
Correct Answer: A
Solution :
The excretory and osmoregulatory organs of the fishes are the gills and kidney. Excretion in bony fishes is ureotelic (i.e., they excrete urea) but some freshwater bony fishes are ammonotelic (i.e., excrete ammonia).
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