If you open a can of chicken noodle soup and immediately examine it microscopically, you will find no microorganisms. If you let the open can sit on the shelf for a few weeks and then examine it, you will find lots of microorganisms. The origin of these microorganisms is most likely:

Question

Quizplus · Accepted Answer

Airborne microorganisms are likely to have settled on the open can over the few weeks it sat on the shelf, leading to an increase in microorganisms present in the soup.

If You Open a Can of Chicken Noodle Soup and Immediately