Which statement about the relationship between bacteria and the human body is most accurate?

Question

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It is estimated that around 100 trillion bacteria reside on or in us, making up about three pounds of our total body weight. While many tissues are kept bacteria-free, bacteria are found throughout the body, with the highest concentrations in the mouth, gut, and skin. The other statements are not accurate; only a small fraction of our body weight is due to bacteria (less than 0.1%), bacteria are not found in equal amounts in different parts of the digestive system, and many types of bacteria can persist on and within the body for extended periods of time.

Which Statement About the Relationship Between Bacteria and the Human