State the three common features of 'all the respiratory organs like skin, gills and lungs.

The three common features of all respiratory organs like skin, gills and lungs are as follows:

i) They have a large surface area to absorb sufficient amount of oxygen.


ii) They have thin walls which makes diffusion and exchange of gases easier.


iii) All respiratory organs like skin, gills and lungs have a rich blood supply for the transportation of respiratory gases.


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