There is no scientific evidence to support the idea that including trans people in sports is unfair to "biological females." Discriminating against trans youth is cruel and only ostracizes these kids more, kids already at higher risk for suicide. Opposing this petition is suicide prevention. In addition to the exclusion of these girls being a moral failing, it would be an invasion of privacy for all of the girls to prove their "biological girlhood."
There is no such thing as biological sex as that very definition of having certain organs, hormones, or chromosomes is muddled by the diversity we see|in each respectively.
Let the girls play! Together, as a team! Embrace diversity as a portal to progress. Reject exclusion as regression. May we move forward stronger together.