The shark is a water animal kingdom. A shark teeth are embedded in the gums rather than directly affixed to the jaw and are constantly repleced throughout life. Multiple rows of replesment teeth grow in a grove on the inside of the jaw and steadily move forward in comparison, some sharks lose 30,000 or more teeth in their life time.
Tails provide thrust, making speed and acceleration depended on tail share. Tiger sharks have a large upper lobe, which allows for slow crusing and sudden bursts of speed.The sharks eyes are similar to the eyes of other vertebrates, including similar lenses, corneas and retains, through their eyesight is well adapted to the marine enviorment with the help of a tissue called, tamptum lucidum.
The sharks are amazing fish that have been around since long before the dinosaurs existed.