They say that hindsight is 20/20, and though the theory of ecological speciation—which holds that new species emerge in response to ecological changes—seems to hold in retrospect, it has been difficult to demonstrate experimentally, until now. They say that hindsight is 20/20, and though the theory of ecological speciation—which holds that new species emerge in response to ecological changes—seems to hold in retrospect, it has been difficult to demonstrate experimentally, until now. Evolution Ecology Phys.org – latest science and technology news stories