People four hundred years ago believed that life could suddenly appear from non-living material or objects, which was identified as spontaneous generation. They observed after it rained worms would arise, therefore they inferred that worms came from the mud!!! Today we have background knowledge from previous scientific studies to know that worms do not come from the mud but from reproduction. Francseco Redi, in the mid-1600s, designed an experiment to disprove the spontaneous generation theory. He designed a controlled experiment to show that flies do not spontaneously arise from decaying meat, non-living matter. He carried out two tests that are identical in all ways besides one factor. The one factor Redi changes is the variable, the chesses cloth cover on the jar. Redi concludes that any differences in the results of the two tests must be due to the variable of the cloth covering. Flies were unable to lay eggs on meat when there was a BARRIER between the outside world and the inside of the jar. Because of this experiment & SCIENCE :
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