Artificial Natural

We are constantly searching for new ways to enhance the current state of our lives. We take our disadvantages as humans only capable of so much physically, and use our surroundings and skills to help create new systems that are capable of doing what we are not. We do anything and everything we can to suit our needs. We use design to better our lives rather than live and adapt to the circumstances afflicting us.
For example, prosthetic limbs. We have the ability to design fully functional limbs. A need for a replacement limb seems a situation that no one would want to be in, therefore the use of design to help aid this circumstance appears quite useful. Although, there would be no need for such designs if we were physically capable of regeneration. Regeneration is the restoration or new growth by an organism of organs, tissues, etc., that have been lost, removed, or injured.

Humans are not evolved enough to restore limbs, although, there seems to be indicators that given enough time to evolve and have the need for this ability long enough it could be possible. From a very young age if the just the tips of your fingers are removed by any reason they will completely restore themselves, but this only occurs when the cells are very new and constantly regenerating themselves. Also, more commonly known is the ability of the human liver to fully restore any lost tissue. Another anatomical part of the human body is the rib. Regeneration is something we clearly can not do to the fullest extent as other biological beings. A starfish is capable of restoring its entire body off of just one lost ray, therefore if a human was capable of this an entire person would grow and develop off of a lost limb. One star fish can generate more than one starfish just from one original source. To us this seems impossible, but how far can evolution go naturally? You see design clearly helps us in our immediate state of need but also does it hinder our natural process to full adapt?