Friedrich Schleiden

Friedrich Schleiden was a German botanist in the 19th century, best known for his role in formulating the cell theory. He proposed that all plants are made of cells, emphasizing that cells are the basic unit of life. His ideas, alongside those of Theodor Schwann, who studied animals, laid the foundation for understanding living organisms as composed of cells. This fundamental concept revolutionized biology, highlighting the importance of cells in both plant and animal life and establishing a framework for modern biology and medicine.