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In 1848 he stated that disease originated in cells by studying medicine.
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In 1838 he wrote Contributions to Phytogenesis. He said that different parts of plants are made of cells.
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In 1838 he concluded that all things are made of cells by studying animals.
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In 1833 he discovered the nucleus in plant cells. He proved how the molecules in a cell function.
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In 1674 he was the first to discover bacteria cells by looking at a drop of pound water. He also proved that it is better to use compound microscopes,
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In 1665, Hooke discovered a cell by looking at a slice of cork through a microscope at 50x. He set a trend for other scientists to look at objects through microscopes.