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: The lining of the [[uterus]] builds up every month to prepare for [[pregnant|pregnancy]]. However, when the [[female]] does not become [[pregnant]] the lining breaks down and exist through the [[vagina]]. This is called a [[Menstruation|period]] but is known in [[biology]] as '[[Menstruation]]'.
: If the [[female]] does become [[pregnant]] the lining becomes the [[amnion]], [[placenta]] and [[Umbilical Cord|umbilical cord]] to protect and feed the [[foetus]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f579 ''Uterus, page 208-9, GCSE Biology; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Uterus, pages 168-171, 173, GCSE Biology; Third Edition, Oxford University Press, AQA '']