| Organism | Respiratory Structure |
| Amoeba | Cell membrane |
| Five-day old tadpole | Internal gills |
| Tapeworm | Body surface |
| Land Snail | Lung |
| Grasshopper | Trachea |
| Organism | Respiratory Structure |
| Amoeba | Cell membrane |
| Five-day old tadpole | Internal gills |
| Tapeworm | Body surface |
| Land Snail | Lung |
| Grasshopper | Trachea |
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