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How Spontaneous Generation was Disproved From the beginning of time it was believed that living things could come from nonliving things This process was known as spontaneous generation However in the middle of the 17th century and then through the next 100 years this idea was disproved by three important experiments We now know that a nonliving object or group of objects can not turn into a living organism Spontaneous generation is impossible in the atmosphere that we have today In the early 1600s people believed that living organisms could evolve from nonliving organisms They proved this by saying that if a piece of meat was left out uncovered that maggots would appear in a few days These worms did not come from anything that they could see so they assumed they came from the nonliving meat In 1668 a man named Redi designed and completed an experiment that showed how this was not true He took two pieces of raw meat and left them out He covered one so that nothing could get in and left the other one open The open one grew maggots and the covered one did not proving that the dead meat did not produce the worms as they had previously thought In the 1700s a man named Spallanzani proved Redis idea to a further extent He noticed microbial growth on boiled pond water after being exposed to the air To prove that this growth came from something living in the air and not from the nonliving water he designed an experiment He boiled pond water to kill all the microbial growths He then poured that water into two separate test tubes He sealed one so that no air could get in and left one open to the air The one that was left open slowly became more and more cloudy with microbial growths The sealed tube stayed as clear as it had been when it was boiled
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