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Yes we will find connection in between the candle, rat and the mint plant in the bell jar because the rat would release the carbon dioxide because of the respiration process in it's body. The mint plant would use up this carbon dioxide for the process know as the photosynthesis and it would give away the oxygen which is used by the rat for respiration and the candle for the combustion process. Therefore yes we can find the relationship between the candle, rat and the mint plant.
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