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Jaden Smith as Kitai Raige in a scene from "After Earth." | Columbia Pictures
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Evolution Driven by Humans' Unnatural Selections

In the film After Earth, the main characters return to Earth after the planet has evolved natural defenses against humans. In real life, plants and animals are evolving in response to human action as well.

May 28, 2013
12:01 PM EDT
African elephants on the safari. | Corbis
Cliff swallows have adapted to avoid cars. | Justin Smith / Wikimedia Commons
Males in some populations of bighorn sheep (Ovis canadensis) no longer grow large horns. | Jon Sullivan
Weeds are even developing resistance to the the kill-all herbicide glyphosate, known by its Monsanto brand name Round-Up. | Corbis
Abandoned warehouses on the Hudson River in 1973. Inset: Restoration efforts on the Hudson, EPA | National Archives and Records Administration/EPA
Red-peppered moths have adapted to blend in better. | Gilles San Martin, Wikimedia Commons; inset: L. B. Tettenborn, Wikimedia Commons
An eastern coyote. | Corbis
A toad is visible in a red-bellied black snake's belly. | CONFIRM CREDIT BEFORE USING THIS IMAGE
Father and son dragnet fishermen hold a giant 45-pound Atlantic codfish aboard their trawler in the North Atlantic Ocean at Gloucester, Mass. | Corbis