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The application of urchin in a more or less pejorative way to a child, much more rarely to a young woman, began in the sixteenth century; These animals begin their life as … Sea urchins are members of the phylum echinodermata, which also includes starfish, sea cucumbers, sand dollars, brittle stars, and … · explore the complex changes in sea urchin populations, their ecological impact, and ongoing efforts to understand and manage … · sea urchin, any of about 950 living species of spiny marine invertebrate animals (class echinoidea, phylum echinodermata) … · sea urchins, or simply urchins, are globular echinoderms that belong to the class echinoidea.
