Sea stars have no brains and no blood. Their nervous system is spread
through their arms and their blood is actually filtered sea water.
The
beloved starfish’s common name with sea star because, well, the starfish is
not a fish. It’s an echinoderm, closely related to sea urchins and sand
dollars.
There are some 2,000 species of sea star living in all the world’s
oceans, from tropical habitats to the cold seafloor. The five-arm varieties
are the most common, hence their name, but species with 1
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Sea stars have no brains and no blood. Their nervous system is spread
through their arms and their blood is actually filtered sea water.
The
beloved starfish’s common name with sea star because, well, the starfish is
not a fish. It’s an echinoderm, closely related to sea urchins and sand
dollars.
There are some 2,000 species of sea star living in all the world’s
oceans, from tropical habitats to the cold seafloor. The five-arm varieties
are the most common, hence their name, but species with 1
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