What was fracesco redi's contribution to cell theory? ?

Https://prezi.com/l7rzp3unvuxv/cell-theory-contribution/

By Ammarah S. & Anita H. & Megan T. Cell Theory Contribution Hans and Zacharias Janssen 1590 1668 Robert Hooke Anton van Leeuwenhoek 1665 Francesco Redi John Needham 1748 Lazzaro Spallanzani 1768 Robert Brown 1833 1839 M.J. Schleiden Theodor Schwann 1838 Rudolf Virchow 1855 Louis Pasteur 1876 Robert Koch 1864 Francesco Redi, an Italian physician, began experiments to refute the idea of spontaneous generation (the idea that life could emerge spontaneously from non-living matter). The Contribution: 

Redi created a basis for refuting the idea of spontaneous generation and thus helping future scientists to advance to the idea that all cells originate from preexisting cells. 

29.1-12=17.1the answer is this one