Q. Who presented that all the plants and animals are composed of cells and that the cell is the basic unit of life?
Answer: M. Schleiden and T. Schwann
Notes: Cell theory was first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann. They stated that all organisms are composed of one or more cells, that cells are the fundamental unit of structure and function in all living organisms, and that all cells come from pre-existing cells.

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