It should be girl's soccer team ;)
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.
Yes, girls can be on a boys soccer team even though there is a girls team already.It really doesn't matter.
A team of girls is ("of girls" is a modifier, a team is the subject and that is singular)
Any girl, girls special soccer teams exist.
The best girls team in the world is King City Royals 1999 girls soccer team in Ontario the A team.
Yes, that is acceptable. Some leagues, competitions, or cultures prefer "junior soccer team" or even "junior men's soccer team", but the original "boys' soccer team" is technically correct and is in widespread use.
There are uncountable girls in the world who are interested in soccer. I am not sure how many girls but I'm quite certain there are lots.
It depends on what style you are writing in. Typical AP format dictates that a soccer team of females is known as Girls' Soccer. I could be wrong on this one, but I think MLA format rules contrarily. In MLA, I do believe it is Girl's Soccer. Good luck.
The plural possessive is: girls' hockey team (a hockey team for girls).
the sames as mens soccer. 11 on the field and 3-5 subs