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The following hypothesis, "Plants restore to the air whatever breathing animals and burning candles remove" was given byA. Joseph PriestleyB. Jan IngenhouszC. T. W. EngelmannD. C. van Niel

Answer» Correct Answer - A
.In 1770 he performed a series of experiments that showed the essential role of air in the growth of green plants. Priestley discovered `O_(2)`, in 1774.
.He experimented with a mint plant.
Priestley observed that a candle burning in a closed space a bell jar, soon gets extinguished. Similarly, a mouse would soon suffocate in a closed space.
He concluded that a burning candle or an animal that breathe the air, both somehow, damage the air.
But when he placed a mint plant in the same bell jar, he found that the mouse stayed alive and the candle continued to burn.
Priestley hypothesis: Plants restore to the air what ever breathing animals and burning candles remove.


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