scientific consensus for half a century that a real, already existing, live, whole human being begins as a human embryo (or zygote) immediately at fertilization. This is a scientific fact - not an "opinion", or a religious or theological belief. And public policy debates and decision making should not continue to escape that unavoidable scientific fact.
https://lifeissues.net/writers/irv/irv_01lifebegin1.html
Dianne N. Irving, M.A., Ph.D.
Professor of Philosophy
Copyright: May 13, 1998