The diversity of life is thought to have arisen through a series of'bursts' of evolution, or 'adaptive radiations'. What conditions cause these bursts, and why do they occur after mass extinctions, on islands, and sporadically through time? Justin Meyer and Rees Kassen provide experimental evidence, in a community containing the protozoan Tetrahymena thermophila and its bacterial prey, that the evolutionary processes causing the bursts are influenced by predators.
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