Question

question 13
8 parts | of 4 points
part e (5 of 8)
which of the following variables did pasteur change in his experiment to test the hypothesis of spontaneous generation?
the shape of the flask
the length of time that the flasks were allowed to sit before being sampled for organisms
the length of time that the broth was boiled
the broth used in each flask

Explanation:

In Pasteur's experiment on spontaneous generation, he used flasks with different shapes (one with a straight neck and one with a swan - neck). The purpose was to see if microorganisms could enter the broth. The length of time the flasks sat, the time the broth was boiled, and the broth itself were not the variables he changed to test the hypothesis. The key variable he manipulated was the shape of the flask to control the access of microorganisms to the broth.

Answer:

A. The shape of the flask