# Structure & Characteristics of Micro-organisms

> Micro-organisms are organisms too small to see with the naked eye. They may be unicellular or multicellular. Some cause disease; others recycle nutrients or help humans (e.g. yeast in bread-making)…

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## More in Biodiversity and classification of micro-organisms

- [Roles & Symbiotic Relationships of Micro-organisms](https://www.hlayiso.com/grade-11/life-sciences/notes/biodiversity-and-classification-of-micro-organisms/roles-and-symbiotic-relationships-of-micro-organisms) — Next section
- [All Biodiversity and classification of micro-organisms sections](https://www.hlayiso.com/grade-11/life-sciences/notes/biodiversity-and-classification-of-micro-organisms)

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