Once every 12 months, once every 6 months, once every 3 months
Triennial
A normal year has 365 Days. Once every 4 years there is a leap year, which is 366 days. If you don't count leap years as special then 12 years = 4380 Days If you count leap years, then 12 years = 4383 Days (3 extra leap year days)
Simple. Being born on a leap year on the 29th of February. As the 29th of February only occurs once every four years, you would have to live for 400 years to actually have your 100th birthday.
last day of the month, 3 years in every 4
An event that occurs once every three years.
Once a year or Once every two years
about once every 3-5 years. yeah
Typically once every 3-7 years.
Rattlesnakes breed once every 2-3 years.
No , it can range from 5-10 years depending on its upbringing
They live around 20-40 years in the wild, but in the zoo they may live longer. Spider Monkeys may live 20 years or more, and females give birth once every 3 to 4 years.
I would say at least once every 3-4 months.
Once every 12 months, once every 6 months, once every 3 months
That depends on the country and the city. Some have them once a year, others have longer terms. So it depends on where the elections are and the laws of that country in relation to elections for the mayor.
Since there are seven days of the week, December 3 (or any other date) will fall on a Friday once every seven years, on average.
the world cup ( I think) happens every 3 years or 4 years?