This video lecture from Homeostasis (F.Sc. second year Biology) covers: Nature of excretory product in relation to Habitats –Adaption of organisms according to their environment i.e. ammonotelic, ureotelic and uricotelic. Urea cycle occurring in liver of animals. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.