Cause because it's doing something or saying something that will have an effect
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.
There is more surface for nails to grip. thats the one for apex
There are three main differences between nuclear and mitochondria DNA (mtDNA): 1.) mtDNA is circular, whereas nuclear DNA is linear. (Both are double stranded) 2.) mtDNA is (generally) uni-parentally inherited, in most animals (not mussels though for example), mtDNA is passed from mother to offspring. from wiki
