Commercial textbooks can cost $30–$100. In many developing economies, this is prohibitive. The "free" aspect of the ZASE biology textbook (when accessed digitally) democratizes education, allowing any student with a smartphone or computer to study.
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The ZASE Biology textbook (Grades 10-12) is specifically written for the Zambian ECZ (Examinations Council of Zambia) syllabus. It covers: Commercial textbooks can cost $30–$100