Question

Why does a lizards tail grow.

Answer 1

Some such lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.

Step-by-step explanation:

Answer 2

They have regeneration and modification abilities.

Step-by-step explanation:

Lizards are able to exert or exhibit modifications that facilitate losing their tail and make tissue damage minimal. Losing their tail is a defense mechanism if a predator catches them by their tail, they can make an escape by shedding their tail off.