the kidneys have a number of jobs as we have discussed before.
they control water levels in the blood, and therefore the blood pressure within vessels. they control pH of blood and excrete waste, eg urea.
urea is a nitrogenous waste, and if split to ammonia, could be harmful to the body. it comes from deaminizing (breaking down of amino acids) and this is done in the liver.
some animals (that lay eggs) dont produce urea however, they produce uretal acid. this is because it isnt soluable. why is that important? coz the waste of the baby in the egg does not float around in the yolk. see in mammals.. waste just transfers to the mother and she excretes it.
so this includes birds, and as we later found out, reptiles. then i asked about monotremes.. and i couldnt get an answer.
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