Question

Сколько на планете число видов хрящекостных

Answer 1

По ныне существует ( 40 видов) хрящекостных, на планете.

Answer 2

Number of Chondrichthyes Species

The number of chondrichthyes species, which include sharks, rays, and chimaeras, is estimated to be around 900 to 1000.

Chondrichthyes is a class of fish that includes the cartilaginous fishes, such as sharks and rays. This class is distinct from the other two classes of fish, Sarcopterygii (lobe-finned fishes) and Actinopterygii (ray-finned fishes)