all periods
Avoiding sex will cause menstruation to occur.
Yes. Evolution ocurred in all geologic periods.
Take it 15ish days before your next period date or around the time you think it will happen. Good luck!
It occurs all the time.
All over the planet, all of the time.
It depends on the country. There is no specified time as to when droughts can occur. They are by no means restricted to the summer months - they can and do occur all year round.
The nearest date I could find was from back to 1888. However all Indian cents from that time period have almost identical designs.
Weathering and erosion occur all the time even when mountains are forming
All syntax errors occur at compile time.
Pregnancy can occur from all acts of intercourse, even when on your period. Sperm live as much as seven days in the uterus.
Life is the period of time between birth and death, during which all of one's personality development, memories, learning, education, work and personal relationships occur.