When you exhale onto a cold window pane water vapor in your breath condenses on the glass. where does the water vapor come from

It comes from  inside your lungs. It's warm and wet inside your lungs and warm air holds more moisture than cold so when you breathe out you are expelling very humid air that is just looking for somewhere cold to condense.

the answer is c most of the fortnite players usually buy v bucks to get the battle pass and other cosmetics but some players who are referred to as "no skins" don't   buy skins and are usually noobs.

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )