Helps with physical protection (won't wash away).
Helps with molecular protection (antibiotic resistance).
A multicellular network can be generated where each individual bacteria expresses different genes, depending on what it's new purpose is. This can support a higher growth potential, as well as improving efficiency of nutrients reaching desired cells via irrigation type pathways etc.
Checkout http://en.wikipedia.org/wiki/Biofilm for more info
How is a biofilm beneficial to bacteria?
Bacteria are stronger as a biofilm rather than planktonic (all alone)
since they cant form tissues, a biofilm is the best they can get
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