Answer:
Although there are many forms of robot that can be used, few if any can be used in certain places or to do certain jobs. The human body is a very versatile shape; it suits many environments and areas, and can complete a wide range of tasks. That versatility in a robot would mean being able to do things a human could do where a human couldn't do them (poisonous, dangerous and instable environments - a nuclear wasteland or a bomb disposal area, for example).