Final answer:
Diversity is the glue of communities, such as biofilms formed by microbes. Biofilms are held together by glycocalyces, facilitating the adhesion of cells to surfaces and creating a protective environment for the microorganisms.
Step-by-step explanation:
The glue of communities is diversity. In nature, most microbes live in mixed communities called biofilms, which provide protection and other advantages. Biofilms are formed through the adhesion of cells to surfaces, facilitated by molecules called glycocalyces. The biofilm acts as a glue that holds the community of microorganisms together.