Turtle is the common name of turtle, also known as tuanyu and Shuiyu, and it is an oviparous amphibian reptile. Water snakes are reptiles.
The individual development cycle of amphibians has a metamorphosis process, that is, the larvae living in water breathe through gills (new organs) and complete metamorphosis in a short time, becoming adults living on land with lung breathing energy.
Amphibians inherit the aquatic characteristics of fish, such as the morphology of eggs and larvae and the way of laying eggs. There are also new roles that adapt to life on earth, such as sensory organs, motion devices and respiratory and circulatory systems. Metamorphosis is not only a new adaptation, but also reflects the changing process of the main organ system from water to land.
Extended data:
Amphibian characteristics:
1. Metamorphic development, larvae live in water and breathe through gills.
2. Most adults live on land, and a few species live in water. Generally speaking, they breathe with their lungs and their skin helps them breathe.
3. The skin is bare, can secrete mucus, depends on the humid environment, and has the function of assisting breathing.
4. The heart has two atria and one ventricle, and the blood is mixed blood with incomplete double circulation.
5. The body temperature is not constant, but a temperature-changing animal.
6. In vitro fertilization, in vitro development, larvae live in water, and embryos have no amniotic membrane.
7. Grow the hind limbs first, and then the forelimbs.
8. Embracing fertilization can not only stimulate both sexes to expel germ cells, but also make sperm and egg cells expel in the same direction, thus improving the fertilization rate.
9. Have backbone.
Baidu Encyclopedia-Amphibians (Chinese Vocabulary)
Baidu Encyclopedia-Water Snake (Reptilia)
Baidu encyclopedia-tortoise