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how do oral contraceptive specifically birth control pills prevent pregnancy

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Hiromiromeroviz
it can  prevent pregnancy because it stops ovulation and makes the uterine lining prevent to prevent fertilized egg. 
Jannajoydviz
oral contraceptives prevents pregnancy by inhibiting the release of hormones that allows the development and release of egg cells and it also  makes the  membrane surrounding the egg cell more difficult to penetrate

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