Part A: How does the author most advance her view about the role of microbes in the body? A by using a famlilar comparison to emphasize the overwhelming number of microbes in the body
B. by providing an example of how certain foods can balance the number of microbes in the body
C. by describing how microbes in the digestive system respond to environmental factors
O D. by emphasizing scientists' lack of knowledge about how microbes behave in the digestive system