Biradial symmetry and lack of cnidoblasts are the characteristics of (a) Hydra and starfish (b) starfish and sea anemone (c) Ctenoplana and Beroe (d) Aurelia and Paramecium.
Option C Ctenophora is a small phylum of exclusively marine, invertebrate animals. Ctenoplana and Beroe are examples of ctenophora. They have biradial symmetry (a combination of radial and bilateral symmetries). They lack the specialized stinging cells (nematocysts) found in coelenterates, but one species (Haeckelia rubra) incorporates those of its jellyfish prey for its own defense
