title: One-third and two-thirds of all "naturally" fertilized human eggs never develop into anything most people would recognize as human.
mesh_terms: D000028:Abortion, Induced; D000029:Abortion, Legal; D004992:Ethics, Medical; D005260:Female; D006801:Humans; D011247:Pregnancy; D014481:United States; D015053:Zygote / Q000502:physiology*