lol, this argument isn't going anywhere if people don't agree on what being alive or dead is.
Looking at definitions is not that useful either.
alive
adjective: 1.(of a person, animal, or plant) Living, not dead.
dead
adjective: 1. No longer alive.
The problem is that people look at it as a discrete system with two states, alive and dead, as if there is nothing in between. However, this is wrong (specially with natural deaths) because you do not instantly go from alive to dead; something happens in between.
Something interesting to read, I recommend reading the whole thing:
http://www.salon.com/2012/03/18/the_..._of_deat h/?1
One of their points is that even doctors have a hard time deciding when someone is actually "dead."
So if there is a process to go from alive to dead, isn't it fair to assume there is a process to go from dead to alive? isn't it reasonable to assume that this process happens before birth?
One way to look at it is that an embryo is neither alive nor dead; but rather it's the process of changing.
If you're going to tell me that this is wrong and that an embryo is indeed alive, then answer the following:
under what basis can you make such argument?
how is an embryo any more alive than reproductive cells, which you probably waste many times in your life?