I would say the apostrophe goes after the s in girls (Girls' Basketball Team). It is talking about a team that belongs to more than one girl.
This depends on what girls basketball team we are talking about. In the WNBA, there are 11-12 players on a team. In college, around 10-12, and in high school, around 10-15.
I think the best name for a girls basketball team is Dunk Madness.
You probably need a possessive: girls' soccer team (the team that belongs to the girls, the team they are part of). But don't be shocked if you see it without the apostrophe-- sometimes people just write it the way you did, even though it should have the apostrophe.
The netball team lol
if your talking NBA: it was Philadelphia in 1947
YES, girls can do whatever guys can do.