Can a starfish grow its arm back?

Yes, starfish have the remarkable ability to regenerate lost or damaged arms. If a starfish loses an arm, it can regenerate a new one over time, usually in a matter of months. This process is made possible by the starfish's unique body structure, which consists of a central disc and multiple arms.

The regeneration process begins when the starfish forms a small, bud-like structure at the base of the missing arm. This structure then grows and develops into a fully formed arm over time. The new arm contains all of the necessary tissues and structures, including muscles, nerves, and blood vessels, to function like a normal arm.

The regeneration ability of starfish is an important survival mechanism that allows them to recover from injuries and adapt to changing environmental conditions. It also contributes to their longevity, as some starfish species can live for decades.