関連ワード:  do amphibians breathe with gills    do amphibians breathe with gills or lungs    do amphibians breathe with gills then lungs    do frogs breathe with gills    do young amphibians breathe with gills    do frogs breathe with lungs or gills    amphibians breathe with gills    amphibians breathe with gills when they are young    can amphibians breathe through gills    do amphibians have gills