6.11: Microbial Growth in Communities Last updated Jan 3, 2021 Save as PDF 6.10D: Oxygen 6.11A: Ecological Associations Among Microorganisms Page ID9199 BoundlessBoundless ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy6.11A: Ecological Associations Among Microorganisms6.11B: BiofilmsA biofilm is an aggregate of microorganisms in which cells adhere to each other on a surface.