A) starfish and sea anemone
B) Ctenoplana and Beroe
C) Aurelia and Paramecium
D) Hydra and starfish
Correct Answer: B
Solution :
Ctenoplana and Beroe lack cnidoblasts and have biradial symmetry. These belong to phylum Ctenophora. Hydra, sea anemone, Aurelia are coelenterates which have cnidoblasts. Although sea anemone has biradial symmetry.
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