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22 July, 18:43

Which best explains why a wood-burning fireplace represents an open system?

A. because they are not all made of brick

B. because a fire requires oxygen from the atmosphere to burn

C. because they can be used for cooking

D. because the ashes have to be swept away

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Answers (1)
  1. 22 July, 19:05
    0
    The answer will be B
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