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Sea Stars, also know as starfish, belong to the animal group echinoderms.
The sea cucumber belongs to the same animal group as the starfish, the echinoderms.
Sea anemone are cnidarians.
the sea star is in both animal and plant group
this is an unclear question to answer. for protection would be my answer. but to give a completely true answer requires knowing what sea animal(s) are we talking about.
Horse
in animal
They Belong to the class asteroidea
Fish
The sea star is often percieved as a starfish, but is is not a fish at all. It is part of a group called echinoderms. This group also includes sea cucumbers and sea urchins. They all have tube feet, they're invertabraes, they have a skeleton under their skin and they have no head.
A mollusc is more closely related to a sea star than a mushroom. Molluscs and echinoderms (which includes sea stars) both belong to the animal kingdom, while mushrooms belong to the fungi kingdom.
They belong to the class Anthozoa.