Science has allowed the possibility of extending our lives, but has never satisfied humanity’s greed. The replacement of diseased or aged organs with healthy ones is now the key to longevity. Benefiting from stem cell and the decoding of animal DNA, the acceptance of organs from our fellow animals eventually would provide us with a fresh stock of donors.
I was told that pigs are biologically more similar to humans then sheep, and they have been used for dissection in biology labs due to the similarity between their organs and human organs.
I invite you to a not too distant future in a location populated with a breed of livestock that supplies human eyes, hearts, livers and other harvested organs. In generations to come, these animals will become more than organ hosts, they will incorporate the science that created them, evolving with traits and behaviors that are distinctly human.
In the world of these new creatures, I see a discovery of joy and sorrow, which would in many ways be similar to ours. As a result, the success of science would inevitably raise greater questions once again...