Lots of awesome things! Each spine fits into a rotator socket, allowing the urchin to move all spines independently. This allows them to catch food and move it towards their mouths, walk around, burrow into shale, and cover themselves in kelp and other material for camouflage.
The classification of a Sea Urchin is Echinoidea
sea urchin
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
Ummm...it's the thing from which a sea urchin hatches?
They can be out of water for a minute or two without much trouble.
I think a sea anenome and a sea urchin can live together because i have a little aquarium and there is a sea urchin and and a sea anenome (if that's how you spell it) living in there and they were perfectly fine. BUT if you have a sea urchin do not have any crabs in there, because my sea urchin killed one, and almost killed another one by taking its claw off. :(
It urges the sea to adapt to IT! The litle urchin urger.
Spines of the sea urchin can cause injuries of the skin.
a blue tuxedo sea urchin
A (street) urchin is a child who lives on the street, surviving by engaging in petty crimes. A (sea) urchin is a spiny creature (exoskeleton), with a soft interior. I welcome improvements to this answer.
Urchin (sea urchin) umbrella-fish