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18 February, 15:53

Which best examples why a wood-burning fireplace represents an open system.

A. Because the ashes have to be swept away

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

C. Because they can be used for cooking

D. Because they are not all made out of brick

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Answers (1)
  1. 18 February, 17:09
    0
    I think it's B, I'm sorry if it's wrong
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