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When most people hear the word bacteria they immediately think of disease and have a sudden urge to wash their hands. But in reality most bacteria are completely harmless. Not only that, many are actually very useful - without them we could not have food, clothing or even shelter! In this set students are introduced to different bacteria that do useful work for us.
1. Bacteria of decay - sm/st
2. Bacteria of fermentation - sm/st
3. Nitrogen - fixing bacteria - in soil - sm/st
4. Nitrogen - fixing bacteria - in nodule - sm/st
5. Nitrogen - fixing bacteria - in roots - sm/st
6. Vinegar bacteria - sm/st
7. Cheese bacteria - sm/st
8. Sour milk bacteria - sm/st
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