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However , where functional assessment is not practical , mitigation projects for streams should generally replace linear feet of stream on a one-to-one basis . It 's a highly complex problem that will require years of effort on a variety of fronts . Moreover , by precisely measuring ocean color , scientists can accurately estimate the concentrations of phytoplankton on a global scale . In this study , the researchers presented observers with two patches simultaneously in the periphery of their line of sight on a computer display : one tilted ( target ) and one vertical ( distracter ) .