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As the worms churn

Burrowing animals mix soil and sediments, shaping the environment and scientists’ understanding of it

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4:02pm, October 23, 2009

To celebrate the 200th anniversary of Charles Darwin’s birth, hordes of readers are reveling in On the Origin of Species, which sets forth the case for evolution via natural selection. Others are poring over The Voyage of the Beagle, the chronicle of Darwin’s five-year, round-the-world expedition.

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