The nitrogenous waste in the cockroach is mainly excreted as:
Urea
Uric Acid
Ammonia
Urea and uric Acid
In Hydra and Amoeba, ammonia is the main nitrogenous waste. Lizards, snakes, birds and insects excrete mostly uric acid but crocodiles and alligators excrete mainly ammonia though they are reptiles. On the basis of this can we generalise that :-