(D) $Sea \text{ } pen$ $(Pennatula)$ is a colonial coelenterate belonging to the phylum $Cnidaria$ (also known as $Coelenterata$).$Sea \text{ } cow$ i

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(D) $Sea \text{ } pen$ $(Pennatula)$ is a colonial coelenterate belonging to the phylum $Cnidaria$ (also known as $Coelenterata$).$Sea \text{ } cow$ is a mammal $(Sirenia)$.$Sea \text{ } horse$ is a bony fish $(Hippocampus)$.$Sea \text{ } cucumber$ is an echinoderm $(Holothuroidea)$.