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The discovery of blood cells in the human body paved the way for advanced studies in cell biology. Early discovery of genes in volved in human development by Edward Lewis, Christine Nusslein and Eric Wieschaus in 1995 is a clear demonstration of the importance of microscopes in the life sciences.
Van Leeuwenhoek invented the microscope, essential for studying cells. Schleiden, using the microscope, observed that cells have nuclei while Schwann and Virchow identified cells in animal tissue; Schwann in the central nervous system, Virchow in bone and connective tissue. Virchow also realised that cells can generate new cells. Source(s): Any biology text.