Animals do NOT excrete waste in which of the following forms?
Hydrochloric acid
Nitrogenous wastes in the body tend to form toxic ammonia, which is excreted in the form of urine. Mammals such as humans excrete urea while birds, reptiles and some terrestrial invertebrates produce uric acid as waste. Therefore, it can be understood that waste is not excreted in the form of hydrochloric acid.