It's "period"
yes
yes.
The Ordovician Period
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prenatal
Elections in the Bahamas often occur every 4 years.
they occur so often that they kill 400000 people a week
A birth rate is a number of births that occur in a period of time in a given area.
they often occur in places close to the ocean so they can get their energy from the ocean water.
they occur in spring and summer time
700b.C- 200a.d