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Biradial symmetry and lack of cnidoblasts are the characteristics of

1. Ctenoplana and Beroe
2. Aurelia and Paramecium
3. Hydra and starfish
4. Starfish and sea anemone

Correct answer: Ctenoplana and Beroe

Solution

Ctenoplana and Beroe are ctenophores, which characteristically show biradial symmetry and do not possess cnidoblasts. Cnidoblasts are found in cnidarians like Hydra and Aurelia, not in ctenophores.

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