Question

fill in the blank question using flasks with swan - neck - shaped openings, pasteur demonstrated that and were the sources of microbes. need help? review these concept resources.

Explanation:

Louis Pasteur's swan - neck flask experiments showed that air and dust were sources of microbes. The swan - neck shape prevented dust - laden air from directly reaching the broth, keeping it sterile until the neck was broken or tilted to allow dust entry.

Answer:

air, dust