When ==Key Stage 3=====Meaning==='''Implantation''' is when an [[embryo]] sticks to the wall of the [[uterus]] and is surrounded by [[tissue]] from the lining of the [[uterus]]. ===About Implantation===: If '''implantation''' does not occur the [[embryo]] is aborted by the [[uterus]].: Following '''implantation''' the [[tissue]] surrounding the [[embryo]] becomes the [[placenta]] and [[amnion]].