Here are the visual aids that best match each description:
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Population clusters within a particular country: Choropleth map or thematic map - These types of maps display population density or clusters by using different colors or shading.
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A cross-section of a cell membrane: Diagram or illustration - A labeled diagram showing a cross-section view of a cell membrane can effectively depict its components, such as phospholipids, proteins, and cholesterol.
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The changes in cell-phone usage from 2000 to the present: Line graph - A line graph is ideal for showing trends over time, clearly demonstrating the changes in cell-phone usage over the given period.
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An outline of the order of topics given in the speech: Bullet point list or outline format - A simple bullet point list or a structured outline effectively presents the order and main topics of a speech.
These visual aids are well-suited for conveying the respective information clearly and effectively.