Question

what did Robert Hooke and Anton valeeumenhoek contribute to the cell theory?

Answer 1

Anton Van Leuuwenhoek was the first person to observe a living cell under the microscope. He also discovered bacteria.
Robert Hooke was the first man to observe dead cork cells.

Answer 2

Robert Hooke further developed the compound microscope, including the use of the iris diaphragm. Hooke kept a detailed record of his observations. he first described cells (or rather plant cells) in his description of a slice of cork he observed under the microscope. He described it as . . . all perforated and porous much like a honeycombe. . . The pores or cells. . .consisted of a great many little boxes. . .

Leewenhoek descovered bacteria from his observations of saliva