The most toxic nitrogenous waste excreted by many bony fishes, aquatic amphibians and aquatic insects is
Ammonia
Urea
Uric acid
Both (2) and (3)
As we have learnt,
Ammonotelic -
Animals that secrete ammonia as waste by the process of Ammonotelism.
- wherein
Many bony fishes, aquatic amphibians and aquatic insects are ammonotelic in nature.