1) Biotechnology: mechanical hand.
2) Thanks to the mechanical hand, people who had no ability with their physical hand will have a functional hand and rehabilitate to their normal life. It helps its host to control it easier and at least have a hand replace for the useless hand they have abandoned.
3 + 4) I think using the biotechionology is right if the patients really have problems with their physical body. Although using mechanical biotechonogy will have more advantages and replace the missing part of body, might be more useful than real hands in the future, but if our bodies don't really need it, don't use it. People from the beginning of the humans history had been using their hands to develop as our human society like today. Some ancestors of ours have honored our body through quotes that's still spreading nowadays. When you use your hand and fulfill your lackness of your body's function, you'll have experiences and practice your independence and through the process of perfecting your lackness, you'll find more things and improve your knowledge, know the advantage and disadvantage in lives. Moreover, your body is given by your holy parents. They gave you your body with the intention that you'll have a good life, be a good person and live by YOURSELF. If you abandon your own body, it means that you throw your parents' wish, your parents' gift away and disrespect the nature.
