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In addition , these projections are " unrealistically restrained " because lawmakers are expected to prevent at least some of the nearly 40 % in cumulative payment cuts coming to physicians over the next nine years , the trustees said . Also , these animals live several years , so their response reflects exposure to these stresses over a long period , and they are fairly immobile , so their condition strongly reflects conditions at the site where they were collected ( see the depleted oxygen and sediment contamination indicators ) . In addition to having good vision to facilitate hunting , these animals have excellent hearing . In recent years , these foundations have become more and more clear , to the point where authorative overviews have become available . Undoubtedly , these decision-makers do deserve criticism . Although Walter took the secret of his mission to his death , these survivors tell his story and reflect on his ability to carry on when others gave up .