Answer:
appendage
Explanation:
Appendages are to any structure that is attached to the main body of an organism. Flagella are the threadlike structures that come out of the plasma membrane and cell wall of most of the bacterial cells. So, the flagellum is an appendage for these bacteria. Likewise, pili and fimbriae are also attached to the surface of the main bacterial body. This makes pili and fimbriae the appendages for the bacterial cells. For a human body, upper and lower limbs are attached to the main body and represent the appendages of humans.
