When is the most possible time for fertilization if the menstrual cycle is 28 days? Why?
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You're most fertile about 12 to 14 days before your next period starts. This is the time of the month when you're most likely to get pregnant. It's unlikely that you'll get pregnant just after your period, although it can happen.

Explanation:

This is because at this stage you are ovulating (an egg is being released from your ovaries)

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answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times