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The time of year that a sea urchin mates is in the coldest part of the year
a long time ago.
The classification of a Sea Urchin is Echinoidea
sea urchin
many
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
yes, sea uchins bite all the time ! yes, sea uchins bite all the time !
20 years
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. :(
a blue tuxedo sea urchin