Question

louis pasteurs experiment in which he boiled broth and allowed it to cool under conditions that prevented exposure of the broth to dust provided evidence against spontaneous generation and in support of the cell theory tenet that
cells are the fundamental units of life.
modern cells evolved from a common ancestor.
all cells come from preexisting cells.
all organisms are composed of cells.
the smallest unit of life is the cell.

Explanation:

Pasteur's experiment aimed to disprove spontaneous generation. The cell theory tenet "all cells come from pre - existing cells" is relevant here. By preventing dust (which could carry pre - existing cells) from entering the broth, and showing no new cells (organisms) formed in the sterile broth, it supported that cells don't just spontaneously generate but come from pre - existing ones.

Answer:

all cells come from preexisting cells.