Mammals metabolize ammonia into a molecule called urea: As you can see, this molecule contains two atoms of nitrogen. Although it requires metabolic energy to build, it also is less toxic than ammonia, and it requires less water to flush from the system.Your urine's main nitrogenous waste product is urea.ammals metabolize ammonia into a molecule called urea: As you can see, this molecule contains two atoms of nitrogen. Although it requires metabolic energy to build, it also is less toxic than ammonia, and it requires less water to flush from the system.
Tree squirrels are squirrels that live in trees and ground squirrels, like chipmunks and prairie dogs, are squirrels that live in the ground. As a general rule, tree squirrels have longer life spans than ground squirrels.1.
Well, actually, flying squirrels don't just live in North and South Dakota, as some people say. They also live in Massachusetts, Minnesota, Michigan, Ohio, Indiana, Illinois, â¦ and many other states.Mostly, they live in the eastern and middle-eastern states. They love to live in trees. nest, usually found in a tree or in the branches of a tree. A squirrel lives in a drey. (Drey is the proper term for a squirrels nest of twigs and leaves).