They are used as radio waves, infrared radiation, visible light.
Question 1 is Athlete's Foot
Question 2 is a virus
Certain studies Suggest that extroverts make more money than introverts, on average.
Extoverts tend to be happier than introverts, regardless of the cultural context.
Introverts are more likely to suffer from depression and asthma.
Hope this helps, Pal
This is pretty dark lol, but I would say "gunshot wound" I have never learned this but it is my best guess.