Power plants release sulfur dioxide and nitrogen oxides into the atmosphere where they combine with water vapor to form carbon monoxide particulates ozone acid precipitation

I’m going to guess these are the choices: a) recreational skiing developed in the mid-19th century b) it was originally invented as a way of getting from place to place in snowy regions c) downhill skiing is currently the only common form of the sport d) it mostly evolved from snowshoeing- if that’s the cases then the answer would be c) downhill skiing is currently the only common form of the sport

Keep your hands washed and trash kept in trash cans.