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If you lament the millions and millions of embryos that naturally die every year (which I doubt you do), you might as well lament the millions and millions of sperm which also do not fertilise an egg.

Being destroyed in a petri dish or being *allowed* to die there, is NOT dying *naturally*. Dying natuarally is not murder. Deliberately ending a life is. When a fertilized egg fails to implant, it's not the choice of the woman and likely she doesn't even know that it happened; that is not murder.

I agree that destroying a cell is not morally equivalent to letting it live. But I don't see why not implanting a cell and letting it live it's full life is morally equivalent to deliberately ending a life. The cell will have lived it's full life. It will have been born, aged, and have died. How is that deliberately ending a life? If the blastosphere is alive, and dies of old age, how is that different from any other cell dying of old age?

jas3