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Two theoretical issues are biological and experimental: For example for the psychoanalytic theory,scientist Freud believed in determination interacting with early family experiences and Erickson believed in balanced biological-cultural interaction perspective

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Theories are a coherent set of ideas that helps to explain phenomena and facilitate predictions that can be tested. A theory supports and compliments the experiment

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The Ethical problems when doing research on humans is that the different methods of research make the results of the experiment more complex

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Scientists use the scientific method to study people. Scientists collect samples to conduct an Hypothesis to collect data to get a result The disadvantages and the advantages when conducting an Hypothesis you have to take the new information and gather information that is already existing. Another disadvantage is that your theory can be false.