Class 11 NEET Biology Excretory Products and Their Elimination

Two waste products removed from the blood in the liver by Ornithine cycle are Ammonia NH3 and Carbon dioxide CO2. The liver contains molecules and enzymes which act on the carbon dioxide and ammonia and changes them to urea, being known as the urea cycle. One cycle takes away two molecules of ammonia and one molecule of carbon dioxide. So, the correct option is 'Carbon dioxide and ammonia'.