yes
yes
Yes, especially in the larval stage. Most species lose their gills when they become an adult, but there are some exceptions.
no
they breathe with gills
through gills
A amphibian has neither lungs or gills
When amphibians are babies, they have gills, but most adult amphibians breathe with a pair of lungs excluding salamanders.
Snakes are "Reptiles" not to be confused with "Amphibians"
hippos are not amphibians they are mammals because they do not have gills and they do not start of as larva
They breathe with gills and lungs
Amphibians
amphibians use gills AND lungs, fish/marine life use gills alone