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Grades

9-12

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Textual, Visual

Permitted Use

Stream Only


Part of

Evolution Series

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Microbe Clock

With each passing generation, mutations accumulate in the DNA of living cells. Among bacteria, which have very short lifespans, new mutations arise very rapidly. In the case of disease-causing bacteria, rapid mutation rates produce antibiotic-resistant strains faster than medicine can keep up. Visit this Evolution Web feature to see how many mutations one sneezeful of bacteria can produce in just one minute.

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