“The conclusion that human life begins at sperm-egg fusion is uncontested, objective, based on the universally accepted scientific method of distinguishing different cell types from each other and on ample scientific evidence—thousands of independent, peer-reviewed publications.” Dr. Maureen Condic, associate professor in the Department of Neurobiology and Anatomy at the University of Utah Health (2014)
"Physicians, biologists, and other scientists agree that conception marks the beginning of the life of a human being—a being that is alive and is a member of the human species. There is overwhelming agreement on this point in countless medical, biological, and scientific writings." Report, Subcommittee on Separation of Powers to Senate Judiciary Committee S-158, 97th Congress, 1st Session 1981, 7.
Any embryology textbook attests to this. It is incumbent upon abortion proponents to explain to us on what basis this science is ill-founded.