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Are single celled creatures like Amoebas alive?
Do we consider parasites that can not survive without a host to be alive?

So, basically a sperm or unfertilized egg are (infact) Alive and so is a fertilized egg ...

When does it become unethical to kill a living creature, and when a living creature becomes a human being are two seperate questions; I think most people would agree that it is fairly unethical to kill a living creature that is not causing you any harm, and the killing of it does not produce any personal benefit, long before it becomes a human being though ...