Neither. It is a fish. That is why it is called a “Puffer fish.”
Mammals, birds, reptiles and adult amphibians breathe using lungs. Fish breathe using gills, while juvenile amphibians breathe using gills and spiracles.
Birds, reptiles and most amphibians breathe through lungs.
Mammals have lungs, as do amphibians, reptiles, and birds. Fish are the only chordates that have gills rather than lungs.
Reptiles always breathe with lungs. Amphibians may breathe with lungs, gills or through their skin.
Yes. Possums are mammals, and all mammals breathe through lungs, just as birds, reptiles and adult amphibians do.
yes
Here they are, from oldest to most recent on the evolutionary tree. In parenthesis after the groups are major adaptions which distinguish a group from the one that came before it. Fish Amphibians (lungs in adult stage) Reptiles (lungs) Birds (warm-blooded) Mammal (give birth to live young)
Most land vertebrates including all birds, mammals, and reptiles have lungs. Most amphibians have lungs as well, though some salamanders breathe through their skin or through gills. A few types of fish have lungs as well Spiders and gastropods and among the few invertebrates to have lungs. Most breather passively through spiracles, their skin, or through gills.
A reptile egg is much much much softer than birds egg.
Reptiles, amphibians and fish are all cold-blooded vertebrates.
When amphibians are babies, they have gills, but most adult amphibians breathe with a pair of lungs excluding salamanders.
Reptiles (snakes, lizards, crocodiles etc) breathe using lungs. If they are underwater they have to come to the surface to breathe. Amphibians (frogs, newts, salamanders etc) are NOT reptiles. Amphibians often breathe through their skin. They can also gulp air into their primitive lungs using their mouth or throat.