Is exemplified by a new starfish developing out of a single ray or arm?

Yes, starfish can regenerate lost arms, and in some cases, a new starfish can develop from a single arm if it contains a portion of the central disc. This remarkable ability is a form of asexual reproduction known as regeneration. The new starfish will grow from the arm, eventually developing into a fully functional organism. This process highlights the incredible regenerative capabilities of echinoderms.