Gender and transgender science is still in a state of flux. There are many recent studies on gender and transgender individuals and societal issues but few, if any, are definitive and widely accepted. One fact is sure, and that is that adolescence, the period following the onset of puberty during which a young person develops from a child into an adult, is the most critical for the formation of gender identity. See: Gender dysphoria in adolescence: current perspectives https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5841333/  (2018). Adolescence is generally defined as occurring from ages 13-19.  As anyone who has been a teenager can attest, feelings towards oneself, the opposite sex, or the same sex, are all in a state of flux during these critical years. I believe that it is inappropriate to mandate certain behaviors in schools K-12, but particularly for ages 5-12.  Biological sex may be more easily identified by children and adults, but transgender and LGBTQ+ individuals are not always easily identified without their help or verbal disclosure. The proposed policies will, in effect, force pre-puberty students and adolescents to make both choices and disclosures concerning their own gender or gender identity before may be ready to do so -- and, in many cases without proper education, counseling, and the time and reflection necessary, in order to do so appropriately. Additionally, this proposed mandate requires a tremendous task of school teachers and administrators, who are unlikely to be fully-equipped and trained to manage all that is expected of them under these policies.  Widely accepted LGBTQ+ and gender identity education and tolerance courses would need to be required for all school teachers and administrators and be settled in advance before these policies could be effectively implemented and maintained.  In summary, gender identity science is not fully settled; adolescents and pre-puberty youth are at risk if policies are not wisely tailored to their needs; and, a lack of complete education and preparation in schools and school districts will invite more harm than good.