Animals do not excrete their wastes in which of the following forms?
Hydrochloric acid
Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea while birds, reptiles and some terrestrial invertebrates produce uric acid as waste. Uricotelic organisms tend to excrete uric acid waste in the form of a white paste or powder.