You Hang a Microscope Slide from a Submerged, L-Shaped PVC

Multiple Choice

You hang a microscope slide from a submerged, L-shaped PVC pipe in lake water that is 2 feet deep. The slide hangs 6 inches below the surface of the water and remains there for eight weeks. When you remove it and bring it to your lab for observation, you see that algae, bacteria, and even some fungi have colonized the slide. You determine that you are looking at a(n)

A) biofilm.
B) community of eukaryotes.
C) biological weapon.
D) endotoxin.