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Lamprey
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Tadpole
Countercurrent exchange
Key terms: gills fish water body aquatic oxygen surface insects opening thin rays blood structure mouth tube operculum species pairs true spiracle pouches bony fish septum contains larva trachea pharynx anatomy respiration tufted exchange physical bubble inside primitive gill arch typically outside surface area lamellae ventilation filaments freshwater surrounding respiratory aquatic insects diffuses out external gills carbon dioxide internal fluids Search external links cited by footnotes on Wikipedia page Gill: |
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