(B) The mode of excretion depends on the availability of water in the environment. Ammonia is highly toxic and requires a large amount of water for it

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(B) The mode of excretion depends on the availability of water in the environment. Ammonia is highly toxic and requires a large amount of water for its elimination. Therefore,aquatic animals,including aquatic reptiles,are ammonotelic because they live in an environment where water is abundant,allowing them to easily excrete ammonia.