In the historical context of microbiology, how did the contrasting experiments conducted by Pasteur and Tyndall contribute to our understanding of microbial growth?

• A. They proved that microorganisms could grow without air.
• B. They demonstrated that microorganisms are present in non-sterile environments but not in sterile ones.
• C. They showed that spontaneous generation is a viable theory for microbial life.
• D. Their work was inconclusive and had no impact on future studies.

Answer: (B)