Number the events from earliest (1) to most recent (6) to outline the development of the cell theory.

Here is the correct chronological order of the events outlining the development of the cell theory, numbered from earliest (1) to most recent (6):

1. Hans and Zacharias Janssen created the first microscope.
2. Robert Hooke was the first to use the word “cell.”
3. Anton van Leeuwenhoek observed small organisms he called “animalcules.”
4. Matthias Schleiden theorized that plants are made of cells.
5. Theodor Schwann theorized that animals are made of cells.
6. Rudolf Virchow theorized that cells come from other pre-existing cells.