sharks bodies are made primarily of cartilage and connective tissue,

which are much lighter than bone. This helps keep them buoyant.

sharks are found from shallow to deep environments, in coastal, Marine and oceanic environment

the earliest shark date back 450 million years ago.

Sharks get through up to 30000 teeth in a lifetime.

Sharks do not have vocal chords.

Sharks do not have bones.

Most sharks have good eyesight.

sharks usually eat meat and plants .