I’m not 100 percent sure but I think a firsthand biography
Answer:
The correct answer for the address that's being inquired and appeared over is that: "To get it how organisms populate the human body and what advantage they give." Based on "A Brief Think about of Guts," the explanation that best summarizes the objective of unused inquire about into microbes and organisms is that To get it how organisms populate the human body and what advantage they provide.
C because "their" is possessive.
