Behavior for skinner can be explained just by reference to its functional skinners term relation to or co variation with the environment and to the animals history of environmental interaction neurophysiological and neurobiological conditions for skinner sustain or implement these functional or causal relations but they do not serve as ultimate or independent sources or . Trials with industry in a natural history study researchers follow people and collect medical and other information about them over time to learn more about how a disease and its symptoms develop and change diagnosis and treatment of a disease are not part of natural history studies the knowledge gained through this study will help doctors better manage treatment for people with cancer
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