"Theoretically, there could be many different scientific interpretations of the question." That is the reason for "why". If you are asking how much this weighs, the answer will be different if expressed in pounds or kilograms. If you are asking in theological terms, the answer would be different than purely scientific terms. It also depends on your theology. Someone, who believes in reincarnation may have a different definition of "when like begins". The reason I gave that answer is it's complicated.
I believe you answered the reasons of why you were asking. I agree if something is kicking, it's alive. But when you start asking about viability,etc.,etc., it comes down to why you are asking.