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Difference between lungs and gills

What is the basic difference between lungs and gills?

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Lungs and Gills are richly vascularized organs which serve for gas exchange between the atmosphere and the circulatory system.

The lungs distinguish from gills in that they are saclike structures always interior to the organism and specialized in gas exchange in terrestrial atmosphere. Branchiae, in their turn, are interior or exterior laminar structures in direct contact with water and specialized in gas exchange in the aquatic atmosphere.

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