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.
Certainly, the 25-man rosters of the 30 major league teams are diverse in other ways. Players of Latin descent made up 28.2 of players on MLB rosters at the start of the 2013 season. But a sharper, ground level view of diversity in sports may explain the 8.3 percent. The baseball landscape has changed in America since the days of Robinson, particularly the landscape of the backyard and the sandlot.