BORIS YARMAKHOV; SERGEY SUMATOKHIN. A DIGITAL ADAPTIVE TEXTBOOK FOR SECONDARY BIOLOGY EDUCATION: DEVELOPMENT AND TESTING: Received: 12th March 2026, Revised: 22th April 2026, Accepted: 05th May 2026, Date of Publication: 12th June 2026. PUPIL: International Journal of Teaching, Education and Learning, [S. l.], v. 10, n. 1, p. 20–29, 2026. DOI: 10.20319/pijtel.2026.101.2029. Disponível em: http://www.grdspublishing.org/index.php/PUPIL/article/view/3219. Acesso em: 15 jun. 2026.