Cubozoans are
polyps
medusoids
polymorphs
sponges

polymorphs

Explanation:

Cubozoans are marine animals, invertebrates of the Cnidarian phylum. Its form is jellyfish, like jellyfish, but these animals are polymorphic, that is, they are subject to change of shape. These animals are part of the cubezoa class and their characteristic form is a box, bell or cube-shaped living water.

Among its main features of Cubozoans are "eyes" with some degree of development and a life cycle dominated by a cube-shaped jellyfish stage.

Cubozoans are important components of marine ecosystems, catching and eating fish, crustaceans and worms, and in spite of their cynidocytes with stinging and poisoning substances, being eaten by large fish and sea turtles.

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the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.