Retention of the firearm, and access to it.
Muzzle control and terrain
Depends on the laws where you are- and you did not give a location. In most US states, when hunting, you may not carry a loaded firearm on an ATV or snowmobile.
The invention of the Firearm
In the U.S. you have to be 21 in most states to get a handgun carry permit.
The invention of the Firearm
Treat all weapons as if they are loaded.
You can get a concealed carry permit in most states, and a few states allow concealed carry without a permit. See handgunlaw.us for more information.
most police officers are required to carry a firearm at all times in the area of arrest power.
The most important factors are nutrition and hormones.
Answer varies state to state. In most cases, pass a background investigation, show that you have had training to safely handle a firearm.
That is a matter of opinion. Many instructors (people that actually do it for a living) will tell you that the best way is in a strong-side hip holster, but many people aren't willing to carry a gun that way. The most basic answer is, there are many ways to carry a firearm. The best way for any particular person is whatever way that suits that person's lifestyle.
precipitation and temperature are the most important