A couple of days following effective fertilization, an embryo results in being a speedily dividing ball of cells called a blastocyst. Juan Gaertner/Science Photo Library via Getty Photographs Promising assisted reproductive technologies come with ethical, legal and social problems – a developmental biologist in addition to a bioethicist examine IVF, https://thesocialdelight.com/story3901400/the-best-side-of-assisted-reproductive-technology