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Zoe forgets to wash her hands before handling some samples in Petri dishes, and as a result, some of the samples become contaminated. What is a likely source of error in this experiment
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Zoe forgets to wash her hands before handling some samples in Petri dishes, and as a result, some of the samples become contaminated. What is a likely source of error in this experiment

User Endyd
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the germs from her hands mixed with those in the petri dishes and some were contaminated 
User Tomislav
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