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 many microorganisms. The origin of these microorganisms is most likely

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Quizplus · Accepted Answer

The microorganisms likely come from the air. Once the can is opened, airborne microorganisms can enter and proliferate over time, especially in a nutrient-rich environment like soup.

If You Open a Can of Chicken Noodle Soup and Immediately