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.
eeeweeddddd
prenatal
A birth rate is a number of births that occur in a period of time in a given area.
they occur so often that they kill 400000 people a week
Elections in the Bahamas often occur every 4 years.
700b.C- 200a.d
YES!
they occur in spring and summer time