[TheDon]

Your question is not entirely clear, but I believe the answer is that by "separating" the "cells" you have created a new life.

[HayekRocks]

So we can split the embryo at the two, four, eight, cell stage, and still have a viable fetus. At some point - I forget when - it doesn't work any more. So you would say that after that point, if we split off a cell, we no longer create human life?

If your answer is that we do not have a human life, suppose at some point in the future we develop the technology to allow that cell to develop into a human being? Suppose we develop the technology to allow an adult stem cell to develop into a human being? Will adult stem cells be human beings then, but not now? Will they only be human beings when we make a decision to let them grow? And if they only become humans when we decide to let them grow, if we change our mind before we do anything, have we killed them?

There seem to be a lot of difficult questions.