Physical is something you can have/ hold and mental is something in ur head that you can't see or hold.
The population must be infinitely large!
Hope this helps!
True.
In the upper layers of the atmosphere, it blocks UV radiation from the sun; however, in the lower layers, it is a pollutant.
This isn't a question, however if you really need to wash your hands you ares is a good place to do so.
