Extremophiles and Biofilms
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An extremophile thrives in heat, salinity, or acidity that would kill most life, and many prokaryotes live inside biofilms rather than freely suspended.
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Thermophilic archaea grow in near-boiling vents, while dental plaque is a biofilm embedded in a gummy matrix on teeth.
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A biofilm's shared matrix makes its members more resistant to antibiotics than free-floating bacteria.