Placoid scales found in........fishes are structurally homologus to vertebrate....

Options :
  1. Lobe-finned........hairs
  2. Cartilaginous.......teeth
  3. Teleosts........nails
  4. None of the above
Answer and Explanation :-

Answer: Option 2

Explanation:

Placoid scales are found in the cartilaginous fishes: sharks, rays, and chimaeras. They are also called dermal denticles, Placoid scales are structurally homologous with vertebrate teeth.

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