I think it is baseball because of how many players are in it.
According to Lahman it would from 1871 to 2008 it would be 17,264 having played pro baseball
a few hundred (not including minor league baseball)
Semour Nipps
yes
I have no idea who Melissa Milano is and I for sure do not care how many pro athletes she has been with. It it really no one's business but hers.
about 67%
20.5 million dollars
18 position players, 1 bench coach 19 total
ichiro suzuki
There is no education requirements for MLB players.
Baseball was invented by the country of the United States and is commonly played there. I believe the United States produces the most pro baseball players in the world.