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Portable Network Graphic  |  1991-11-09  |  3.1 KB  |  512x342  |  4-bit (3 colors)
   ocr: 20 Click on the best answer 19 The sketch represents a molecule IT of methane (CH4. What is the 18 shapeof this molecule. 12 15 13 (allow 4 seconds to reset after wrong answers)