How
To
Stop pregnancy Using Hormone
(Progesterone and oestrogen)

Explanation:

Most birth control pills are "combination pills" containing a mix of the hormones estrogen and progesterone to prevent ovulation (the release of an egg during the monthly cycle). A woman cannot get pregnant if she doesn't ovulate because there is no egg to be fertilized.

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it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added