why lizards can regenerate their tails and starfish their whole body. But we can’t regenerate our limbs.

Question

why lizards can regenerate their tails and starfish their whole body. But we can’t regenerate our limbs.

In: 4

Answer 1

Our limbs are much more complicated structures compared a to lizard’s tail or starfish’s body, also in a wild environment full loss of a limb would have a high likely-hood of resulting in death meaning there’s no environmental pressure to encourage limb regeneration.

Edit: Words

Answer 2

Not an answer but something worth knowing: Under certain circumstances we CAN grow back parts.

Examplary article: https://www.npr.org/sections/health-shots/2013/06/10/190385484/chopped-how-amputated-fingertips-sometimes-grow-back