Which group's members have had both lungs and gills during their adult lives?

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Lungfishes are the only group of organisms that have both lungs and gills during their adult lives. This allows them to survive in environments with low oxygen levels by using their lungs to breathe air and their gills to extract oxygen from the water. Sharks, skates, and rays only have gills, lancelets only have pharyngeal gills, and bivalves only have gills.

Which Group's Members Have Had Both Lungs and Gills During