in later versions, if you fly too high and lose your world in minecraft PE, you can kill yourself by digging to the end of the world. but in 15.1 you can't kill yourself
You will lose all the items in your inventory and your experience and respawn.
Depending on what you mean by "lose" your world it could be corrupted or not installed properly and you might have just acedently deleted it but if you did any of those thing I am sorry to tell you but think you will not be able to get it back.
Nothing will happen if you keep installing and uninstalling Minecraft. Minecraft does not track how many times you have installed it nor does track how many computers you have it installed on. The only drawback is if you uninstall Minecraft by deleting the .minecraft folder you will lose all of your saved worlds on that computer.
the engines won't get enough power and oxygen if you are too high, and the plane might stall since it will lose speed.
No, all your saves will stay.
Cancel it. Identity Theft is very common nowadays. The chances of someone finding it and using it are high.
you lose conciousness. if the accident is severe you may lose a specific function
What happens if i lose my phone in the house and it is nowhere to be found?
If your in a Bounty hunter world +1 you lose everything but the most valuable item you keep. But if you die in a normal world with a skull you lose everything, but you can get your stuff back if you get to your grave in time.
No, but dogs (wolves) do lose health and will eventually need to be fed.
they probably have bad computers
it makes your armor stronger so you lose less lifes