Most amphibians breathe with gills as larvae and with lungs as adults.
All frogs are amphibians.
Most frogs breathe with gills as larvae and with lungs as adults.
What breathes with gills as larvae and with lungs as adults.
Options:
  Salmon.
  Frogs.
  parasites
  Whales.
  Mice.
  a fish
  air
  tortoises