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  -examined very small pieces of cork under a microscope and saw "tiny pores" and called them cells
-had no observations of a nucleus or any other organisms - 
  
  -made mircoscope which gave magnifications up to 270x , which was the finest at the time
-with his mircoscope, he discovered the existence og single-cell organisms, such as protists, spirogyra
-with this he discredited the idea of spontaneous generation - 
  
  was the first to investigate respiration and also did experiments on osmosis. he also was first to see the importance of the function of individual cells in an organism.
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  discoverd the importance of the cell nucleus and theorized about the connection the cell division
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  -found a new group of one-celled animals called protozoans ( which he called rhizopoda )
-observed other life substances that retained no form and the substance sarcode ( later called protoplasm )
- refuted Ehrenberg theory that microspoic animals have the same organs as other animals - 
  
  he obsereved the formation of yeast and the fermentation and concluded that this was because of a life process
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  came with the theory that every cell comes from a preexisting cell or that every cell is not completely original