Some embryos do not survive through to the fetal stage, which begins about two months after fertilization. when this happens, the mother is said to have had a) endometriosis. b) a miscarriage. c) a toxic shock. d) an implantation.

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species