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Janssen inveted microscope. We wouldn't be able to see cells without it.
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Robert Hooke first talked about cells while observing cork
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Antoni van Leeuwenhoek learned to grind lenses and to assemble them into simple microscopes.
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Anton Van Leeuwenhoek discovered and discussed about bacteria
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John Needham, a Scottish clergy man, showed that soup that had been exposed to the air contained many micro organisms.
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Lazzaro Spallanzani, an italian abbot and biologist, did quite a few expirements on Needham's work over the soup and air. He determined that soup in a sealed container was sterile and that micro organisms that caused the soup to spoil had entered from the air
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Robert Brown discovered cell nucleus
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In 1838, cell theory was first enunciated but it was not yet the cell theory.
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Schwahnn proposed that all organisms are composed of cells.Together with Matthias Schleiden he formed the cell theory of life.Schwahnn also discovered the cells, now known as Schwann cells, that form a sheath surrounding nerve axons and conducted expirements that helped disprove the theory of spontaneous generation.
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Theodor Schwann and Matthias Schleiden created what is called the cell theory.The cell theory states that all living things are made up of one or more cells.
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Rudolph Virchow was the one to recognize leumekia cells
