Invertebrate animals are animals that have no backbone. Animals are classified according to Kingdom, Phylum, Class, Order, Family, Genus, Species. The invertebrate group that the animal described above belongs to are;
Echinoderms are a phylum of marine invertebrates. Examples are sea stars, brittle stars, sea urchins, sea cucumbers, etc.
They undergo external fertilization and their reproduction is dimorphic. They have spiny skins whose outer parts are protected with hard plates.
Therefore, the correct answer is B.
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