On the importance of increasing students’ interest in the subject with the help of optional classes in the subject of biology. Journal of Educational Sciences, [S. l.], v. 73, n. 4, p. 118–127, 2022. DOI: 10.26577/JES.2022.v73.i4.11. Disponível em: https://bulletin-pedagogic-sc.kaznu.kz/index.php/1-ped/article/view/1635. Acesso em: 13 jul. 2026.