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Other bacteria and germs could contaminate the contents in the dish. The dish is meant to isolate a subject in an experiment so one can study it. While in the dish, one can control the reactions by putting in what they want in the dish. If the dish is left open, then one will be studying the contaminates and will not get accurate results from their experiment.

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14y ago
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13y ago

A petri dish should not be left open for extended period of time because it increases the probability that the culture will be contaminated.

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16y ago

A Petri dish is used as a container for a medium used to grow cultures. Leaving the Petri dish open will increase the probability that your culture will be contaminated.

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Q: Why should a petri dish not be left open for any extended period?
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