Answer:
Our human body works like machines. As machine have a structure and based on that it performs its function.
Human body has more movable joints and less number of immovable joints. It needs to be flexible in order to perform different functions in the body.
The movement of the body such as bending, stretching, walking, sitting are some of the important functions that the body performs.
These movements are possible only because the body need to perform possible functions.
