The term "amphibians" may not be familiar to you, but you should be familiar with frogs. You must know that frogs are tadpoles. Tadpoles are like fish in both external form and internal structure, have tails, breathe with gills, and can only live in the water like fish. After the tadpole develops into a frog, the tail and gills disappear, giving birth to limbs and lungs, which can live on land. Frogs are amphibians.
Through observation, you will find that the frog has a tympanic membrane behind the eyes, which can perceive sound waves; the front of the head has a pair of nostrils, which are channels for breathing; the frog's forelimbs are short and can support the body; the hind limbs are developed, and there are webs between the toes, which can both jump and paddle.
These characteristics of the frog's body allow it to live on land and move in the water. The frog's ability to adapt to terrestrial life is also inseparable from its ability to breathe with its lungs. However, the lung structure of frogs is simple and underdeveloped. The frog's skin is bare and secretes mucus, and the moist skin is densely covered with capillaries, and gas exchange can also be performed to assist lung breathing.
Toad (toad)
Giant salamander (baby fish)
newt
Toads, salamanders, salamanders, etc. are amphibians like frogs. Their main features are: the larvae live in the water and breathe with gills; the adults mostly live on land and can also swim in the water, breathe with the lungs, and the skin can assist in breathing.
Do you know each other? Welcome to leave a message, pay attention to me not to get lost.