No, sea urchins are animals. They are echinoderms (meaning "spiny skin") and are related to sea stars, sea cucumbers, and sand dollars. They eat kelp and other forms of algae.
A sea urchin is an invertebrate.
uh, yeah, because it's not a plant =o
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
An urchin barren is a marine ecosystem characterized by the dominance of sea urchins, particularly the green sea urchin, which has overgrazed kelp forests and other marine vegetation. This overgrazing leads to a significant decline in kelp, resulting in a barren landscape devoid of plant life, which negatively impacts biodiversity and the overall health of the marine environment. Urchin barrens can develop when predator populations, such as sea otters, are reduced, allowing urchin populations to proliferate unchecked.