Multiple choice

The teeth of shark are modified:

  1. ectoderm

  2. keratin substance

  3. placoid scales

  4. dermis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Shark teeth are evolutionarily modified placoid scales, also called dermal denticles, which cover the shark's skin. These structures have the same basic composition as teeth - an enamel-like outer layer and a dentine core surrounding a pulp cavity. As teeth wear out or are lost, new ones rotate forward from reserve rows behind.

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