## Answers

Bacteria are ours Friend and Foes. They are useful in lot many ways for examples

- Single cell protein - many bacteria have rich amount of protein and so they are taken as food like Spirulina
- Fertilizers - Bacteria fix the atmospheric nitrogen in the soil which increases it's fertility , eg - Rhizobium

3.Antibiotics - Bacteria are sources of antibiotics , eg - benzyl penicillin - Sewage Treatment - Bacterial flocs are used to treat the polluted water
- Normal Flora- Normal flora are bacteria that colonizes some of your body parts to keep the bad bacteria out.

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