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The symbiotic relationship is commensalism because the tiny fish gets a place to hide while the sea urchin is unaffected.
no
the purple sea urchin
of course it is! look up sea urchin in the da dictionary!!!
A salt-water body. Like a SEA or ocean. It says in the name SEA urchin.
No, not even remotely.
150 pounds and counting
The Purple Sea Urchin's diet consists of plants, animal matter, including algae, dead fish, sponges, decaying matter, mussels, barnacles, and kelp. The Purple Sea Urchin is the prey of crabs, sunflowers stars, snails, most birds, fish, sea otters, and humans. The Purple Sea Urchin is actually a delicacy in some countries.
They do, which keeps the sea urchin strong and not brittle.
the migrate to the very bottom of the ocean way back in the deep feet
the colors a sea urchin could be is black olive brown purple blue and red
what is a hydra