Keeping in view the definition of excretion, as discussed earlier, that it is the elimination of waste metabolites, several products may be included in the list of excretion product on these specific conditions. Similarly,salts removed by animals of hypertonic environment are the excretory products for these animals. Otherwise, overwhelming nitrogenous waste metabolites constitute the excretory products.
Primarily, in the catabolism of acids the amino group is released or transferred to another molecular for removed or reuse. Amino group not reused for recycling of