The degree of inclusion of international test skills (PISA) science and skills of the twenty-first century in the biology book for the sixth scientific grade in the Republic of Iraq. JMR [Internet]. 2024 Jan. 1 [cited 2026 Jul. 26];19(38):28-60. Available from: https://jmr.uomisan.edu.iq/index.php/jmr/article/view/199