Embryology is not the "Domain Science". Regardless if "ANY" scientist or textbook wants to claim that the zygote is a living human then they need to give an explanation of why this is so.
ROFL well when it comes to this subject yes it is and the science dictates that life begins at conception when the two haploid organism each produced by a another human being join together and a new life is created at that moment. You don't get to change the science to make your position on abortion more palatable.