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Why do Chondrichthyes have a poor fossil record?

What does a swim bladder do?

Which fins are paired?

Sharks move via ... undulations of the body and caudal fin

The basking shark swims with its mouth open, is this free of problems?

In the evolution of bony skeletons, cartilage is replaced by

A bony skeleton is less or more effective at serving as an attachment point for muscles?

Is bone better at transmitting muscular force than cartilage?

The skeleton of the paired fins is formed from many small or large bones?

Do fins contain a lot of muscle?