It is a different number every year. It all depends on the talent level.
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This varies by league. Many leagues do not have a roster maximum. Competitive high school leagues will have roster maximums around 25 players. However, on the field at any time there can only be 9 defensive players, the same as Major League Baseball.
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No you need nine for a full team.
40
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They find the best high school baseball players in the nation. The best pitcher, 1b, 2b, 3b, etc.
In Canadian football, while only 12* players are playing on the field at once, teams need more than just 12* players. They must have an offensive and defensive team. Most high school football teams have 1st, 2nd, and 3rd string players, so thirty to forty players is a reasonable number. * only 11 in American football
Each league (little league, high school, college) has its own limits as far as how many players can be on a team. In Major League Baseball, there are 25 players on a team.
unless u are the best in D-3 it is very unlikely
most teams i have seen and played on have had 12 to 13