When David Baum was an undergraduate at the University of Oxford, he pondered, as students are wont to in the small hours after the bar has closed, one of biology’s most basic questions. It was this: how did eukaryotic cells (the complex sort that make up every plant and animal as well as lots of unicellular creatures like amoebas) evolve from prokaryotic ones (bacteria and their kin) which are much simpler?
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