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This media file is a photograph of an open textbook. The textbook pages display an illustration and text related to cell biology. The illustration, titled "Figure 3.5 Cell division: Simplified diagram of mitosis and meiosis," visually represents the processes of mitosis and meiosis, showing mother cells, replicated chromosomes, and daughter cells at various stages of division. The text on the left side of the page discusses cellular structures and their functions, including ribosomes, endoplasmic reticulum, and Golgi apparatus. It also touches upon the role of enzymes and waste material. The right side of the page is divided into three sections. The first section, under the heading "Mutation," explains what mutations are, their potential causes, and their implications for genetic inheritance. It also includes a small diagram illustrating sex determination through X and Y chromosomes. The second section, titled "Transport of substances across cell membranes," discusses passive transport and diffusion, including the mechanisms by which substances cross cell membranes. The third section details facilitated diffusion. Visible text includes headings such as "Mitosis," "Meiosis," "Mutation," "Transport of substances across cell membranes," "Passive transport," "Diffusion," and "Facilitated diffusion," along with detailed explanations and diagrams. The text is written in English. There are no people, discernible outdoor settings, or indications of time of day or weather. The context is purely educational, focused on biological processes within cells. The emotional tone is neutral and informative.
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