The human body is made up of about 100 trillion cells. A certain percentage of these cells are in fact independent microorganisms known as the human microbiome. What percentage of our bodies is made up of these independent organisms?

3%

Explanation:

Even though the human body contains more independent microbe than human cells (10 to 1), due to the small size of these micro-organism, they take only 1 - 3 percent of the body's mass but play a vital role in human health