No, all your saves will stay.
You will lose all the items in your inventory and your experience and respawn.
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
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
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.
Compression artifacts in images can lead to potential imperfections such as blockiness, blurriness, loss of detail, and color distortion.
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Check the forums for your other mods to see what mods they are compatible with.
If you are asking for a username and password of another person's account, here is not the place to do so. Not only can their account be subject to a password change, but they may lose their account. I recommend buying Minecraft, if you find it a good game!
MINECRAFT!!!!