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Hooke's most important publication was Micrographia which discovered the term "cell" while discussing the structure of the cork. Hooke looked at a piece of cork through a microscope and that is how the discovery was made.
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Leeuwenhoek discovered single-celled organism which today is bacterial. He discovered living cells like bacteria and protozoa when he looked at pond water through a microscope. He disproved Hooke's theory because he realized that some cells are living organisms.
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Leeuwenhoeck discovered spermatozoa, concluding that eggs are fertilized when entered by sperm. He made his own high quality microscopes and that is how his discoveries were made. He discovered that maggots and fleas were not spontaneously generated. He showed that they reproduce from eggs to maggots to pupae to adults.
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Brown discovers the nucleus in plant cells and suggest its importance in cell creation. He is known for the continuous motion of minute particles in solution which was named Brownian motion. While investigating the fertilization in cells of orchids he termed the "nucleus" of the cell. His model improved the Leeuwenhoek cell because it added a nucleus to the cell of plants.
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He defined the cell as the basic unit of animal structure. Schwann discovered the enzyme pepsin which helps digest food in your stomach. Over dinner with Schleiden they discussed plant and animal cells. From their conversation, Schwann discovered nuclei in animal cells.
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He was the first to recognize the importance of cells as fundamental units of life. He studied many plants using a microscope. He added to what was know about cell theory. He did not disapprove anything.
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He correctly identified that diseases are caused by malfunctioning cells. He identified and named the Leukemia. He proved that all cells come from pre-existing cells. He saw a cell divide into two cells underneath a microscope. This added the third and last part of the cell theory. This did not disprove the model of the cell at this time. He stated that every cell originates from another cell.
