Ward Kischer, PHD., Human Embryologist, Emeritus Professor of cell biology and anatomy at the University of AZ College of Medicine. Specialty in Human Embryology, said:
"Every embryologist in the world knows that the life of the new individual human being beigns at fertilization. It is not a belief; it is a sceintific fact."
"We exist in a continuum of life. Now, at any given moment in that continuum, there exists a whole integrated human life."
See this compelling video addressing the question of when life begins. Though many would like to think that there is no answer, and that it's merely a religious belief that life begins at conception, science itself also makes a firm statement affirming that life begins at conception.