air sac
Noun
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is a type of: sac - a structure resembling a bag in an animalis a part of: lung - either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
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is a type of: sac - a structure resembling a bag in an animalis a part of: insect - small air-breathing arthropod
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is a type of: sac - a structure resembling a bag in an animalis a part of: bird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
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