As larvae they use gills. As adults some use lungs exclusively, some also use their skins and some use their skins exclusively. For a lengthier account you might like to read the wikipedia article.
An alligator is a reptile not an anphibian.
Yes, a turtle is an anphibian
an anphibian
yes
Yes, they are.
its a a cow
no but it swims alot
Yes, they are amphibians.
No, a cat is a mammal.
no it's a fish
No ! A duck is an aquatic bird !
A Gorilla is a mammal, and is an ape (primate).