Why is the body so carefully organized, from small levels up to large levels? What does this careful organization help the body accomplish?

The answer is b. increased blood flow reduces nerve sensitivity

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.   

It's called the nephron.