What is the primary mechanism by which the combined oral contraceptive pill prevents pregnancy?

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Reduces movement within the fallopian tubesBlocks the process of fertilizationStops the fertilized egg from attaching to the uterusSuppresses the release of eggs from the ovaries

Explanation

The main contraceptive effect of the combined pill is due to its ability to inhibit ovulation, preventing the release of an egg and thereby reducing the chance of pregnancy.