Robert Hooke and Leeuwenhoek were pioneers in observing cells, leading to the development of the cell theory by Schleiden and Schwann.
Robert Hooke is credited with using the term 'cells' for the first time in 1665 when he observed cork under a microscope. Antonie van Leeuwenhoek was the first to observe a living cell in pond water in the 1670s. Matthias Schleiden and Theodor Schwann proposed the unified cell theory in the late 1830s, stating that all living things are composed of cells.
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