Ammonia Naim 00:49 AP Biology Chapter 32 Ammonia A) has low toxicity relative to urea. B) is the major nitrogenous waste excreted by insects. C) is soluble in water. D) can be stored in the body as a precipitate. E) is metabolically more expensive to synthesize than urea. Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+