2. Gecko can grow a new tail because its severed tail is not at the junction of two coccygeal vertebrae, but at the special cartilage diaphragm in the middle of the same vertebral body, and the cells in the cartilage diaphragm can keep the characteristics of embryonic tissue for life and differentiate constantly, so that a tail exactly the same as the original can be regenerated from the severed tail soon.
3. The phenomenon of "tail-cutting regeneration" mainly appears in amphibians and reptiles, such as salamanders in amphibians. In addition, starfish also has amazing regeneration ability. Not only can the broken wrist foot grow back, but even a complete starfish can grow from the broken wrist foot.
Extended data:
Animals with regenerative ability
Some animals in nature are born with peculiar regenerative abilities, and different animals have different regenerative abilities. Generally speaking, invertebrates have stronger regeneration ability than vertebrates. ?
If you cut the worm in half, or cut the earthworm into many segments, each segment will grow into a complete individual again.
When the crab was in distress, it lost its limbs and abandoned its claws. After a period of time, these lost parts will grow back and have the same function as the original limbs.
Newt's limbs are damaged and can be brought back to life.
Sponge, even if it is cut into many small pieces, each piece can live independently, and the longer it grows, the bigger it becomes. What's even more amazing is that even if several kinds of sponges are mashed, screened and mixed together, the same kind of sponge can still grow according to the planned degree, retaining the overall memory and regrouping into small sponges.
Baidu encyclopedia-gecko
Baidu encyclopedia-regenerative ability