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प्रश्न
State the three common features of all the respiratory organs like skin, gills and lungs.
उत्तर
All the respiratory organs like skin, gills and lungs have three common features.
(a) They have a large surface area to get enough oxygen.
(b) They have thin walls for easy diffusion and exchange of respiratory gases.
(c) They have a rich blood supply for transporting respiratory gases.
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