Answer: Natural factors of population change can't be swayed by humans. So for an example of a natural factor take an Earthquake. An Artificial factor for population change is something specifically made by humans.
In Florida, if a person with PWC is equipped with an engine cut-off lanyard, the person must use this with being able to attach the lanyard to the person itself. It could either be in his or her clothing or the PFD.
Generally, all monarchs rule for life or until they abdicate.
Because they become a monarch after their parent's death (the previous monarch), they could be crowned only in their 50's and consequently rule for about 20 years.
However, it is not unheard of that very young people become monarch, such as Austrian Francis Joseph, or Queen Elisabeth, and then they can rule for over 60 years.
