Matthias Schleiden was a German botanist who played a critical role in the development of cell theory in the 19th century. He is best known for his assertion that all plants are made up of cells, which was a groundbreaking idea at the time and helped lay the foundation for the understanding of cellular biology. Schleiden’s work, along with that of others, contributed to the recognition that cells are the basic unit of life in both plants and animals.
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