Which of the following is not one of the three main types of human waste a urine b carbon dioxide c oxygen d feces

OXYGEN is not one of the three main types of human waste

Explanation:

Human wastes are basically the waste products that are formed as result of the metabolism that takes place in our systems, especially the digestive system. So the major wastes that the digestive system produces are nothing but urine and faeces.

Also carbon dioxide is let out as a waste during respiration. We take in oxygen which is required for our survival and put out carbon dioxide as waste. Oxygen is indefinitely a required gas for various processes that occur within the body, especially respiration, whereas carbon dioxide is mainly a waste product.