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http://glencoe.mcgraw-hill.com/sites/0078778301/student_view0/chapter3/section3/self-check_quiz-eng_.html

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https://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__control_of_the_cell_cycle.html

http://glencoe.mcgraw-hill.com/sites/0078778066/student_view0/chapter4/section1/self-check_quiz-eng_.html

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