Metabolic waste excreta. Some mammals including humans excrete uric acid as a component of their urine but it is only a small amount. These compounds form during the catabolism of carbohydrates and lipids in condensation reactions, and in some other metabolic reactions of the amino acids. Oxygen is produced by plants and some bacteria in photosynthesis, while CO is a waste product of all animals and plants. Nitrogen gases are produced by denitrifying bacteria and as a waste product, and bacteria for decaying yield ammonia, as do most invertebrates and vertebrates. Water is the only liquid waste from animals and photosynthesizing plants.
What U Need? What U Need? "what U need?" is a single recorded by Chinese singer Lay for his debut extended play "Lose Control" . It was pre-released on October 7, 2016 by S.M. Entertainment as a birthday gift for Lay's fans. Produced by Devine Channel and Lay, "what U need?" is described as a "Pop-R&B" song with lyrics about being overwhelmed by a loved one. "what U need?" music video was released on October 7, 2016. It features Lay with backup dancers dancing the song's choreography. Lay performed "what U need?" for the first time on October 9 at the 2016 Asia