Yet you missed the obvious fact that science doesn't even have a good definition for life, in fact it's a hard problem in the philosophy of science. You could

Yet you missed the obvious fact that science doesn't even have a good definition for life, in fact it's a hard problem in the philosophy of science. You could say that the replicating mass of cells will in the future become a human being and that is not true of a sperm (unless it later goes on to fertilize an egg), but a sperm is just as "alive" as a fertilized egg.