Physiologically speaking all sharks share certain characteristics. Outline these characteristics and state, if any, exceptions exist.

Sharks have some fascinating features which make these animals to be best adaptable to live in an aquatic environment and also for hunting.

Some of the physiological features include:

1) The skeletons of sharks is not made up of bones, rather it is made up of cartilages. This makes the skeletons of sharks lighter and more flexible.

2) The esophagus of sharks is short but wide which makes it adaptable for swallowing smaller preys. It also allows the larger preys to be gulped down.

3) A shark eats only about 5% of its body weight per week. It can survive without food for many days due to its  slow metabolism.

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