One of Earth’s most abundant lifeforms has a fatal flaw

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For decades, scientists believed a major group of ocean bacteria was ideally suited for life in waters with very little food. New research suggests that this assumption may be incomplete. These microbes appear to be far more sensitive to environmental change than previously thought.

The bacteria, called SAR11, are the most abundant life forms in surface seawater across the globe. In some regions, they account for up to 40% of all marine bacterial cells. Their ...

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