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OpenStudy (anonymous):

Which of the following phyla contains only marine animals? Arthropoda Chrodata Echinodermata Mollusca

OpenStudy (anonymous):

I'm not 100% sure but I believe it's Mollusca. I would wait for someone to confirm that though.

OpenStudy (anonymous):

It's not Mollusca, because land snails are in that phylum. Phylum Enchinodermata is the one you're looking for, for it consists of sea stars, sea cucumbers, sea urchins, and brittle stars.

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