(1) In human being NH3 is convert in urea is liver
(2) Insect birds and land nail are urecotelic
(3) A small amount of water is wasted n excretion of anomia however not much energy is used in doing so.
(4) More energy is required in the preparation of urea but not a large amount of water is needed to be lost
(a) TFFF
(b) TFFT
(c) TTFT
(D)TTTF
