their gills which then allowed their their gills which then allowed their lung to evolve into the swimbladder lung to evolve into the swimbladder
Evolutionary Tree of Life (Full Series)
How native speakers pronounce “swimbladder”
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their gills which then allowed their their gills which then allowed their lung to evolve into the swimbladder lung to evolve into the swimbladder
Evolutionary Tree of Life (Full Series)