A couple of days right after thriving fertilization, an embryo becomes a quickly dividing ball of cells known as a blastocyst. Juan Gaertner/Science Photograph Library through Getty Images Promising assisted reproductive technologies have moral, legal and social worries – a developmental biologist and a bioethicist go over IVF, abortion as https://socialbuzzmaster.com/story3983340/5-simple-statements-about-in-vitro-fertilization-explained