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Overall , the tool improves on previous retrospective georeferencing methods by a ) increasing speed , b ) enabling a user to represent a locality as a two dimensional shape [ e.g ., a circle , buffered line , or irregular polygon ] , c ) integrating place-name look-ups and a variety of spatial measuring tools to assist drawing a locality ; d ) quantifying the precision of a locality ; and e ) facilitating the capture of metadata to document the geo-referencing process . Because of variation in these genes , the venom of a single snake species can differ geographically , and even between individuals . The tool improves on previous methods by : a ) integrating place-name look-ups with a variety of spatial measuring tools to assist the placement of localities ; b ) enabling a user to represent localities as two dimensional shapes [ e.g ., a circles , buffered lines , or polygons ] , c ) quantifying the precision of localities ; and d ) facilitating the capture of metadata to document the georeferencing process . This conversion of a vague locality description into a single subjective point creates the problem of false precision , often to a scientifically unacceptable degree . The Prosobranchia only have a single set of tentacles , the eye is located at the base of the tentacle , there is a door called an operculum which can seal the animal within the shell , they breathe by gills , and the sexes are in separate animals ( bisexual ) . The inherited idiosyncrasies of genes and the response of living bone to the stresses of the environment add individual variation to the theme of a single species . Some browsers have a tendency to " remember " parameters from previous queries . In other words , it allows a user to derive coordinates like " 39.1919 , -121.4210 " for a specimen that was found at " Sheep dip , near Hammonton , Yuba County . The department also houses a modern bioacoustics laboratory and an extensive sound library of over 4,000 recordings .