The hydrologic, carbon, nitrogen, and phosphorus cycles are essential to the . this is why they are called biogeochemical cycles.

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.   

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.

Some of their responsibilities are to evaluate safety, efficiency, and effectiveness of the biomedical equipment. train people on how to properly operate biomedical equipment. lastly is to research the engineering aspects of the biological systems of humans and animals.