for protection
Sea Urchin !
No, a sea urchin and a sea anemone are two different sea creatures nothingalike.They do have some alike characteristics.like they both use their long tentacles , or spikes for protection.
the sea urchin has many adaptions like its spikes to protect it self from predators.
they puff up like a ball with spikes. It looks something like sea urchin when it puffs up.
sea urchin :)
The classification of a Sea Urchin is Echinoidea
sea urchin
A young sea urchin is called larva, pluteus (free-swimming stage), or juvenile.
they use the poison in there spines to defend themselvesfor example when a predittor gets to close or steps on the sea urchin it releases a poision.
A sea urchin does move, but not very frequently.
because the crab needs the sea urchin for protection and the sea urchin needs the crab for food