Answer:
A Bunch of parts of the animal are used by humans, hides of animals can be used for luxury scarfs, clothing, or pants, they're hooves are usually used for cups or portable bottles, most of the meat on an animal used used, most of the waste meat of an animal (such as meat on tail, its internal organs, and sometimes its repreductive organ) are usually grinding up and turn into canned sausages or SPAM you might see in stores that are usually fairly cheap because they aren't too healthy to eat, the bones are usually used for dog treats, decorations or new teeth replacements sense some animals bones are strong enough to be a tooth replacement, and parts of an animal that might not be used such as the eyeballs, or brain and other internal organs might be just simply thrown away by a butcher into an area of a forest ( some butches either throw away meat waste into garbage bins but risk raccoons getting in and some throw them away somewhere outside near a foresty area so that animals will eat it)
Hope this Helps!