What is spontaneous generation? Describe the experiment that Francesco Redi performed that disproved the theory of spontaneous generation.

Spontaneous generation, the hypothetical process by which living organisms develop from nonliving matter.

Explanation:

In 1668, Francesco Redi, an Italian scientist, designed a scientific experiment to test the spontaneous creation of maggots by placing fresh meat in each of two different jars. One jar was left open; the other was covered with a cloth. Days later, the open jar contained maggots, whereas the covered jar contained no maggots. He did note that maggots were found on the exterior surface of the cloth that covered the jar. Redi successfully demonstrated that the maggots came from fly eggs and thereby helped to disprove spontaneous generation.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.