About once a month
yes
A period of 25 years is called a "quarter century." This term is often used to refer to significant milestones or anniversaries that occur every 25 years.
The frequency refers to how often an event occurs over a specific period of time, while the duration is the length of time that event lasts.
yes.
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prenatal
A birth rate is a number of births that occur in a period of time in a given area.
700b.C- 200a.d
YES!
Hi, Your period will usually occur during the period you take the non-active pills or have a break from taking your pills. The break lasts for 7 days and your period will occur any time during the 7 days.
they occur so often that they kill 400000 people a week
Elections in the Bahamas often occur every 4 years.