State 3 characteristics of the respiratory organs in animals.
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The three common characteristics all the respiratory organs like skin, gills, and lungs are -:
1》All the respiratory organs have large surface areas to get enough oxygen.
2》All the respiratory organs are thin-walled for easy diffusion of gases and substances.
3》All the respiratory organs (like the skin, lungs, gills) have a rich supply of blood for transporting respiratory gases..
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