Problem- Does bacteria rise from broth?
Hypothesis- If you boil broth and tightly seal the jar, then no microbes will grow
Experiment- He boiled the broth for an hour and sealed the first jar, left open the second jar and shortened the boiling time, and the third was let open a little and boiled for an hour
Conclusion- Microbes come from the air
Hypothesis- If you boil broth and tightly seal the jar, then no microbes will grow
Experiment- He boiled the broth for an hour and sealed the first jar, left open the second jar and shortened the boiling time, and the third was let open a little and boiled for an hour
Conclusion- Microbes come from the air
O the first row (going from side to side) it shows when he boiled broth for an hour and then left it for a few days and microbes grew. On the second row (going from side to side) it shows when he boiled broth for an hour, then sealed the jar and left it for a few days and no microbes grew.