A large surface area to allow as much oxygen to enter the gills as possible due to the fact that more of the gas comes into contact with the membrane
aquatic | Aquatic animal | The Life Aquatic with Steve Zissou | Cellular respiration | International Academy of Aquatic Art | cellular respiration | Aquatic Species Program | The Life Aquatic with Steve Zissou (soundtrack) | Swiss Federal Institute of Aquatic Science and Technology | Respiration organ | Outdated restoration of aquatic ''A. altus'', by Charles R. Knight | Aquatic locomotion | aquatic animal |