Excretion in tadpole is
A tadpole is the larval stage in the life cycle of an amphibian, particularly that of a frog or toad. They are usually wholly aquatic, though some species have tadpoles that are terrestrial. Animals excreting their nitrogenous waste in the form of ammonia are known as ammonotelic (examples: aquatic invertebrates, bony fishes and aquatic amphibians). So, the correct answer is ‘Ammonotelic’.