Their Scales Most Closely Resemble Teeth in Both Structure and Origin

Question

Their scales most closely resemble teeth in both structure and origin.
A)amphibians
B)nonbird reptiles
C)chondrichthyans
D)mammals
E)osteichthyans

Accepted Answer

The scales of chondrichthyans (cartilaginous fish such as sharks and rays) are composed of dentin and enamel, which are the same materials found in teeth. Additionally, both teeth and chondrichthyan scales develop from structures called placoid scales.