people were to disappear tomorrow

That also means that even if people were to disappear tomorrow,evolution would be driven by our choices to date.We're making a new homogenous world of certain favored plants and animals,like corn and rats.But it's a world that's not as resilient as the one it replaces.As the fossil record shows,it's a diversity of plants and animals that allows unique pairings of flora and fauna to respond to environmental challenges,and even thrive after an apocalypse.