1. Turtles are not amphibians.
2. Turtle is not an amphibian.
Amphibians refer to larvae that develop in water and use gills to breathe. When they grow up, they live on land and use lungs to breathe and skin to assist breathing. It's an amphibian. Such animals are represented by frogs, toads, newts and salamanders.
Amphibians are a type of animal that can live both in water and on land. The animal's skin is moist and sticky, but not impermeable. When they are young, they use gills to breathe. When they become adults, their gills disappear and they breathe using lungs. Because amphibians have small lungs and require moist skin to assist breathing, adult amphibians need to stay in humid areas. Their food also switches from aquatic plants to insects or small animals.
The turtle uses its lungs to breathe, but its chest cannot move. It is a swallowing breathing method. Every once in a while, it has to put its head out of the sea to breathe. But they can also live underwater for a relatively long time, because they all also have an organ with a specific respiratory function - the anal sac, a pair of thin sacs on both sides of the rectum. The walls of the anal sac are densely covered with many capillaries. . When green sea turtles inhabit the sea, they can rhythmically contract the muscles around the anus to allow seawater to flow in and out between the anus, rectum and anal sacs. At this time, the red blood cells in the tiny blood vessels can absorb oxygen from the seawater without having to stick out their heads. The surface is breathing. The so-called amphibians refer to larvae and adults that undergo major morphological deformation, that is, "metamorphosis." For example, in a frog, the respiratory system changes from a tadpole's gills to a frog's lungs. The tortoise will not undergo the above changes in its lifetime, so the tortoise is not an amphibian, but a reptile.