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It is no longer possible to think that art developed following a linear evolution from crude beginnings to sophisticated summits ; it is far more likely that different levels of artistry and sophistication coexisted in various regions throughout time . A - A slug is any terrestrial snail that the shell has been completely lost or has been reduced to a plate buried in the mantle . This kind of redundancy can be called " false duplication , " since different locality descriptions are used to signify what is intended to be the same place . A snake handler at a small roadside zoo in Arizona is momentarily distracted as he handles a large western diamondback rattlesnake .