Instruction on gender identity, sexual activity, or sexuality shall not be included in the curriculum provided in grades kindergarten through fourth grade, regardless of whether the information is provided by school personnel or third parties. For the purposes of this section, curriculum includes the standard course of study and support materials, locally developed curriculum, supplemental instruction, and textbooks and other supplementary materials, but does not include responses to student-initiated questions. (2023-106, s. 2(a).)