| Front | How does scanning electron microscope work |
| Back | A beam of electrons passes across the surface and the secondary electrons are detected. Image produce is 3-D. The specimen is stained in heavy metals such as(osmium, lead, and gold). System is in a vacuum so there are no collisions with air particles restricting electrons getting to the surface of the specimen |
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| Front | Biotic |
| Back | Living features of the ecosystem e.g food |
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| ID (hidden) | 4af374dbd0064fd392210ebb397efe64-ao-7 |
| Header | Structure of the heart |
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