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These placoid scales are found in cartilaginous fishes. They are also called dermal denticles. These scales do not grow in size, more are simply added as the fish grows larger.

Placoid Scales of a Shark

These placoid scales are found in cartilaginous fishes. They are also called dermal denticles. These…

The bony and cartilaginous skeleton.

Human Skeleton, Showing Bony and Cartilage Tissue

The bony and cartilaginous skeleton.