(D) The 'Portuguese man-of-war' is the common name for $Physalia$ $physalis$.It belongs to the phylum $Cnidaria$ (also known as $Coelenterata$).It is

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$A$ polymorphic,colonial coelenterate

(D) The 'Portuguese man-of-war' is the common name for $Physalia$ $physalis$.It belongs to the phylum $Cnidaria$ (also known as $Coelenterata$).It is a colonial organism consisting of specialized individuals called zooids that perform different functions,making it a polymorphic colony.