Answer
If heat-resistant spores had been present in the broth, the Spontaneous Generation Hypothesis would have appeared to have been confirmed.
Work Step by Step
Heat resistant spores would have started to grow after boiling, making it appear that cells do spontaneously generate from non-living matter. This would have delayed development of Cell Theory until these spores were discovered. The history of science often depends on skillful choice of experimental systems and what seems like luck, in this case, the absence of heat resistant spores.
