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Your uterus is getting an environment ready for a baby.
http://wiki.answers.com/Q/Why_is_it_useful_if_the_...
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menstruation.
http://wiki.answers.com/Q/When_does_the_lining_of_...
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">To prepare for the implantation of a fertilised egg.
http://wiki.answers.com/Q/What_is_the_purpose_of_t...
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I may not be a doctor or so but i believe it has something to do with that when a woman is pregnant she needs to have the uterus thick otherwise the fetus would be "flushed"
http://wiki.answers.com/Q/Why_does_the_uterus_lini...
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