Could you be more specific? I can't really answer the question when it's written like that (no offense).
Answer:
Chondrichthyes characteristics include a cartilaginous skeleton, lack of a swim bladder, lipid storage restricted to the liver, unique hematopoietic organs, and bacteremia in clinically normal individuals. Variable reproductive strategies are employed throughout this vertebrate class.
Explanation:
1. Because kids have time to do everything
They were classified by their use.
