Name the hormonal composition of oral contraception used by human females. Explain how does it act as contraceptive?

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Please find below the solution to the asked query  
          
Oral contraceptive pills contain either progesterone or progesterone−oestrogen combination, which causes a hormonal imbalance of the body.  They are given in small doses and inhibit ovulation, implantation as well as alter the quality of cervical mucus to prevent or retard the entry of sperms.

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