How are bony fish better adapted to a swimming way of life than cartilaginpus fish?

Cartilaginous fishes have an internal skeleton made of cartilage and their skin is covered with placoid scales.

While, The bony skeleton of bony fishes is harder and heavier than cartilage. Bony fishes have either lungs or a swim bladder and hard, thin scales.

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Cartilaginous fishes have an internal skeleton made of cartilage and their skin is covered with placoid scales.

The bony skeleton of bony fishes is harder and heavier than cartilage. Bony fishes have either lungs or a swim bladder and hard, thin scales.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive