What did Matthias Schleiden discover and in what year?

Answer 1

In 1839 Schwann proposed that all organisms are composed of cells. Together with Matthias Schleiden he formulated the cell theory of life. Schwann also discovered the cells, now known as Schwann cells, that form a sheathsurrounding nerve axons and conducted experiments that helped disprovethe theory of spontaneous generation. He coined the word metabolism to define the chemical changes that take place in cells and he demonstrated that yeastorganisms cause fermentationof sugar solutions.