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Respiratory systems: The structures that an animals uses to exchange gases…
Respiratory systems: The structures that an animals uses to exchange gases with its surroundings make up the respiratory system
Land animals: 
Adult amphibian lungs are small and do not have many pockets. Therefore the main respiratory structure for an adult amphibian is its skin.
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Fish:
Most of these animals use either their outer body coverings or their gills as respiratory structures.
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Examples: Cnidarians use their outer body coverings for gas exchange and fishes, mollusks, and arthropods use their gills
Insects:
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In more complex animals the layers have folds or pockets that increase the surface area for gas exchange
Examples: Grasshoppers have tracheal tubes, which have opening for gases to enter and leave the body, spiders have structures called book lungs, which are made up of thin, stacked cell layers
Birds:
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