You have read the text "Caring for Concussions: More Than a Bump on the Head," in which the author presents information about the impacts of the most common type of brain injury. In your opinion, should medical follow-up care be mandatory for adults diagnosed with concussions? Write an argumentative essay that supports your claim with clear reasons and relevant evidence. Provide details from the text to support your response. HURRY

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

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answer; dr.black,who allows only certain individuals to mate;