Answer:
Robert Hooke observes cells in cork under a microscope.
Antonie van Leeuwenhoek observes single-celled organisms under a microscope.
Matthias Schleiden proposes that plants are composed of cells.
Theodor Schwann proposes that animals are composed of cells.
Rudolf Virchow proposes that all cells come from preexisting cells.
Correct order:
Robert Hooke observes cells in cork under a microscope.
Antonie van Leeuwenhoek observes single-celled organisms under a microscope.
Matthias Schleiden proposes that plants are composed of cells.
Theodor Schwann proposes that animals are composed of cells.
Rudolf Virchow proposes that all cells come from preexisting cells.