This is how robots & prosthetic can help human life.

Robots can help people by accompanying the elderly and the can help us with cleaning and things around the house.  They could also help with people that can't talk.

Prosthetic arms can help people with disabilities like not having the rest of their arm the could have part of it, but not all of it.  Prosthetic legs can help people that don't have legs or part of their legs.