Answer: Summary below
Explanation:George Steinhauser made an important discovery about bellybutton lint. He was curious and wanted answers, so he began studying his own bellybutton lint. He discovered that the naval lint contains cotton from clothing, as well as dead skin, sweat, dust, and fat. His research also helped explain how lint accumulates. As it turned out, the hair on the human stomach acts as small hooks that capture and hold contents within. You may shave your stomach, but the hairs act as a natural way to protect your bellybutton from germs and unwanted objects.
Sodium and aluminum are in the same period, and therefore have similar chemical properties. It's B.
I believe that pacing refers to the speed at which the speaker pronounces words and phrases, basically the speed at which somebody talks.
