Sea urchins grow through a process called metamorphosis, starting from a fertilized egg that develops into a free-swimming larva. This larva undergoes several stages, eventually settling on the ocean floor and transforming into the adult form. As they mature, sea urchins feed on algae and other organic materials, which helps them develop their hard spiny exoskeleton. Growth can take several years, depending on the species and environmental conditions.
they control the population of sea urchin which helps kelp grow.
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?
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