Not every state allows them on teams. Most state hs athletic associations require they be an enrolled student to play competitively. So you need to ask your local high school or search the state board of education website and the state hs athletic assn

Yes

They have homeschool teams, club teams. But no, not homeschool “high school” teams.

I’m sure it depends on your school district.

In Wisconsin homeschools can play highschool sports in their home district. They are also able to take 2 classes a semester

In Wisconsin, yes. https://docs.legis.wisconsin.gov/statutes/statutes/118/133

I know in Indiana they can participate in middle and high school extracurriculars with part time enrollment (one or more classes). We have plenty of friends whose kids took specialty classes or ones harder to manage at home so their kids could participate in sports or FFA or whatever.

I don’t understand the question? I home school but my kids are 8 & 2 they are in soccer and dance…..