Is it true that excreted waste is rich in nutrients?

The correct answer is false. 

Excreted waste, including urine and feces, is the body's way of eliminating waste and toxins from the body. While urine does contain some nutrients such as nitrogen, phosphorus, and potassium, it is not considered to be rich in nutrients. Feces, on the other hand, contains mostly undigested food, dead cells, and bacteria, and is not considered to be a significant source of nutrients. Therefore, excreted waste is not rich in nutrients.