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Grew a willow tree in a weighed amount of soil. After five years, he discovered that the willow tree weighed about 74 kg more than it did at the start.
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The first evidence that gases participate in photosynthesis was reported by Joseph Priestley in 1772. However he discovered that if a plant is placed in an atmosphere without oxygen, it soon replenishes the oxygen, and a mouse can survive in the resulting mixture.
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Discovered photosynthesis by showing that light is essential to the process by which green plants absorb carbon dioxide and release oxygen
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