Sea Urchin

SEA URCHIN is a spherical marine invertebrate occuring along the rocky coastal shoreline at the tide line and subtidally. Urchins are related to the SEA STAR and SAND DOLLAR, all members of the phylum Echinodermata ("spiny-skinned"). The urchin's lumpish body is covered in spines, which are used for defence and movement. Between the spines are slender tube feet, which pass bits of food collected from the water to the animal's mouth, located in the middle of its underside and surrounded by small...

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