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Humans have nostril for respiration,fishes have gills for respiration similarly frogs have cutaneous type of respiration on their skin.
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we all need different organs for respiration or for breathing.

like- mammals need lungs,fish need gills and amphibians like frogs use their moist skin when they r in water and lungs when they r on land.

cutaneous respiration is a type of respiration in which the respiration takes place through the moist repiration.for discussing them in ur class room u can explain he process of respiration in different animals including frogs by using charts and other attractive things

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