why aquatic animals are affored to be ammonotelic

 Ammonotelism is the type of excretion in which ammonia is the main nitrogenous waste material. Such animals are called ammonotetic.

It is found in aquatic animal groups like sponges, coelentrates, crustaceans, echinoderms, bony fish, tadpole larvae and salamander.
 

Ammonia is produced as a result of catabolism of proteins, especially in the liver cells by oxidative deamination of excess of amino acids in the presence of oxidase enzyme.

Ammonia is highly toxic and must be metabolised or expelled from the body as soon as possible.

Ammonia is highly soluble in water and a very large volume of water is needed by the animal to dissolve ammonia. 1 gm of ammonia needs about 300 - 500 ml of water. But this is not a problem for animals living in an aqueous habitat which are generally found to be ammonotelic.

 

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Because they have enough water for excretion of ammonia
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Aquatic animals are ammonotelic since they produce ammonia as excretory product. Now ammonia is a very toxic product that cannot be stored in the body for a long time and requires high amount of water per gram for their excretion. Since aquatic animals are surrounded by water, the ammonia quickly diffuses through their body.
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Why can aquatic animals afford to be ammonotelism
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