If they don't, they will explode of poo. stomach will fill with poo.
Any animal that eats food must excrete waste products.
The criteria for living things is actually a quite extensive list. Living things must exchange gas, drink, eat, grow, and excrete waste.
Answer:Every "animal" poops. and gross why would u ask that.
Any system which consumes "intake" - be it an animal's digestion or a car's engine - must either use that intake totally, or dispose of that part of the intake which is not used. If the unused portion is not disposed of the system will clog as this 'waste' accumulates. If you block a car's exhaust pipe, the engine will soon stop as the waste gases have nowhere to go. If an animal were not able to excrete its waste products then its bladder and its bowels would swell up continually to try to store the waste. Eventually, were there no limit to how big these could grow to, the animal would be unable to move.
Honey bees do not excrete waste from their digestive system like mammals do. They release waste (e.g. feces) from their bodies through their hindgut. However, honey bees do excrete excess water as they regulate the water content in the hive through evaporative cooling.
This process is called Bioremedation
Vertebrates have the same waste-disposal problems as invertebrates. They must deal with the very toxic ammonia their bodies produce, and most vertebrates must expel wastes while conserving water.
They take a day or two to digest the food. Then it turns into unwanted waste and they body must get rid of it. So the turtle simply excretes the waste through the rectum and moves on.
Carbon dioxide and urea
Because they eat food, like us. It has to come out too. ========================================================== Waste products means it now useless, and remaining their will make you sick. But actually not all waste product is not totally "WASTE", C02 when mixed into red blood cell will become bicarbonate--which is also a buffer. Urine, and sweat releases urea--which contains nitrogenous products (I assume you already knew why about nitrogen). Concise explanation. Look for encarta or other books to see why we must elmnate
Fish excrete waste primarily through their gills by releasing ammonia directly into the water. Some fish also excrete waste through their skin, digestive system, and kidneys. The ammonia produced by fish waste is toxic and must be diluted and removed by water circulation in the aquarium or natural water body.
the waste products must be cleaned up to blood waste then leaves the body in the urine the digestive system and kidneys work together to provide nutrients and remove .