Answer:
Terrestrial adaptation
necessitated the production of lesser toxic nitrogenous wastes like urea and
uric acid for the conservation of water. Mammals and many terrestrial amphibians
mainly excrete urea and are called uriotelic animals.
Ammonia produced by
metabolism is converted into urea in the liver of these animals and released
into the blood, which is filtered and excreted out by the kidneys.
Some urea is
retained in kidney in order to maintain osmolarity, reptilelos birds, land
snails and insects excrete nitrogeneous waste, as uric acid in the form of
pellet or paste with a minimum loss of water and are called uricotelic animals.
Conversion of ammomia to uric acid and its subsequent elimination requires
lesser amount of water.
Hence, due
to less availability of water on land, and in order to minimise water loss, terrestrial
organism adapted themselves accordingly.
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