41.   If you believe life begins at the moment of conception, as the religious right and Catholics do, abortion takes not a fertilized egg but a life.

42.   In IVF, eggs from women are fertilized with sperm in a petri dish, and often, three to five fertilized eggs are implanted.

43.   In other species, polarization comes a bit later, after the fertilized egg has split a few times into a cluster of identical cells.

44.   Instead, they work by preventing ovulation or by preventing a fertilized egg from implanting in the uterine wall.

45.   It prevents implantation of a fertilized egg, and opponents have called it tantamount to abortion because it keeps an embryo from developing.

46.   It works by preventing a fertilized egg from implanting itself in the womb.

47.   IUDs containing copper prevent the sperm from joining the egg, those containing hormones prevent the fertilized egg from implanting in the uterus.

48.   Mitochondria have their own DNA, and mitochondrial DNA is passed from mothers to offspring because sperm do not contribute mitochondria to a fertilized egg.

49.   Nearly two decades after doctors perfected the art of freezing human embryos, the dilemma of what to do with leftover fertilized eggs is growing.

50.   Most Americans are not ready to give a fertilized egg total legal precedence over a living adult or teen-aged woman.