hss live question paper for class 11 zoology breathing exchange of gases
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Gills are used by most of the aquatic arthropods and molluscs whereas lungs are used by the terrestrial forms for the exchange of gases.
4. Fishes use gills whereas reptiles, birds and mammals respire through lungs.
5. Frogs can respire through their moist skin also.
6. Mammals have a well developed respiratory system.
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