Answer:
The process of
excreting ammonia is called ammonotelism. many bony fishes, aquatic amphibians
and aquatic insects are ammonotelic in nature. Ammonia, as its readily soluble,
in water is excreted by diffusion across body surface or through gill surfaces
(in fishes) as ammonium ions.
It is highly soluble
in water and requires large amounts of water to be lost from the body.
Such a mode
of excretion is thus suitable for aquatic organisms which have a constant access
to water.
Terrestrial
adaptation requires the production of lesser toxic nitrogenous wastes like
urea, as urea is less toxic and less soluble in water. This is important
adaptation for water conservation in animals body. Mammals, many terrestrial
amphibians and marine fishes mainly excrete urea and are called ureotelic
animals.
In most insects land
snails, reptiles etc., uric acid is excreted, hence they are called uricotelic
animals. Conversion of ammonia to uric acid and its elimination requires less water,
thus it is very essential for terrestrial forms that do not have constant water
supply.
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