Which of the following animal regenerates the fastest?

The power of regeneration refers to the ability of an organism to replace or repair damaged or lost body parts or tissues. Many organisms possess this remarkable ability to regenerate, from simple organisms like single-celled bacteria and yeast to complex animals like amphibians, reptiles, and mammals. Regeneration can occur through various mechanisms, such as the proliferation of undifferentiated cells or the reprogramming of specialized cells to become pluripotent.

Axolotls are larvae of salamanders that are native to Mexico. They are known for their remarkable ability to regenerate their limbs, spinal cord, heart, and other organs throughout their life. The axolotl has been studied extensively as a model organism for regeneration research due to its remarkable ability to regenerate complex structures.

The axolotl undergoes regeneration because it is capable of producing large numbers of undifferentiated cells, called blastemal cells, which can give rise to various types of tissues. When a limb is lost, the axolotl's immune system quickly clears away any debris and forms a wound epidermis over the injury site. This wound epidermis then signals the underlying cells to start dividing and forming a blastema. The blastema is a mass of undifferentiated cells that will eventually differentiate into the various types of cells needed to regenerate the lost limb.