The cartilaginous fishes contain scales:
Correct answer: A. Placoid
- A. Placoid
- B. Ganoid
- C. Cycloid
- D. Ctenoid
Explanation
Placoid scales (microscopic) are a characteristic of Chondricthyes also known as Elasmobrachi. While Ganoid, Cycloid and Ctenoid scales are found in Osteichthyes also known as Teleostomi.
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