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.
Animal waste can help to fertilize the plants.
pigs
their waste...
Yes, animal waste can contain nitrates as a byproduct from the breakdown of nitrogen-containing compounds in the animal's body. When animal waste is not managed properly, such as in concentrated animal feeding operations (CAFOs), nitrates can leach into soil and water sources, causing environmental concerns.
oxygen and bacteria
The waste is returned to the soil as nutrients.
No part - if it can be digested then its not waste.
A animal could eat the waste and think it's food and the animal could die.
Yes, the waste products of animals are manure and urine.
PIG
we were formed by animal waste.
dung