The pH of water determines the solubility (amount that can be dissolved in the water) and biological availability (amount that can be utilized by aquatic life) of chemical constituents such as nutrients (phosphorus, nitrogen, and carbon) and heavy metals (lead, copper, cadmium, etc.).
No clue as to find out how many professional players are in those countries. Baseball in the US This information is for the US only: For Major League Players - There are 30 Major League teams each with a 40 man roster. 30 x 40 = 1200 Then, on average, each team has 6 farm teams in its system with a roster of 25 to 30 players. So 6 x 30 x 30 = 5400.
As of 2014, there are approximately 1,696 players in the United States' National Football League (NFL) and 265,000,000 players in the World Football League. The total number of active players per season varies depending on the version of the sport.