Within A crack on the lengthy tradition of grouping all fish into one class (Pisces), fashionable phylogenetics sights fish for a paraphyletic group. You will discover around 530 species of sharks. A shark’s pores and skin is roofed with placoid scales, which might be similar to tooth in their composition; https://maps.app.goo.gl/kTisAZCbSjAw6nkX8