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Zacharias and Hans Jenssen invent the first microscope.
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While looking at a sliver of cork through a microscope, Robert Hooke discovers the cell.
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Francesco observes rotten meat to see if it turned into flies.
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Anton looked at many things including blood cells and bacteria, and carefully drew what he saw.
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Needham discovered that soup that had been exposed to the air contained micro organisms. He theorized that a life force was present in all inorganic matter including air and oxygen that could cause spontaneous generation.
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Exactly what it says...
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Lazzaro Spallanzani, a biologist and abbot in Italy tried several variations on the experiments done by John Needham. He discovered that soup that was kept sealed did not contain the micro organisms that appeared in soup open to the air. He determined that micro organisms get into the soup from the air.