Placoid scales present in
(A) Hippocampus
(B) Carcharodon
(C) Exocoetus
(D) Pterophyllum
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Explanation:
Placoid scales are found in sharks and rays, and can vary greatly in external appearance. Unlike the scales of bony fishes, placoid scales do not increase in size as the fish grows, instead new scales are added between older scales. Placoid scales are often referred to as denticles.
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