AP BIOLOGY

Detailed explanation-1: -Spallanzani’s experiment showed that it is not an inherent feature of matter, and that it can be destroyed by an hour of boiling. As the microbes did not re-appear as long as the material was hermetically sealed, he proposed that microbes move through the air and that they could be killed through boiling.

Detailed explanation-2: -Spallanzani boiled a meat and vegetable broth and placed this mixture into clean flasks. He sealed one and put it in boiling water. As a control, he subjected another flask to the same conditions, except he left it open. Within 2 days, the open flask had a population of microorganisms.

Detailed explanation-3: -What purpose did boiling the meat broth serve in both the Spallanzani and Pasteur experiments? Boiling ensured that there were NO living organisms in the broth at the beginning of the experiment.

Detailed explanation-4: -Interested in questions about generation, Spallanzani performed the first artificial insemination of a viviparous animal, a spaniel dog, a feat he recognized as one of his greatest accomplishments. These results further convinced him of the ovist preformationist doctrine.