Because of the nature of the subject students writing a biology extended essay must make a special effort to maintain a reasoned logical logical argument that focused on the research question essays that attempt to deal with a large number if variables are unlikely to be focused and coherent a clear and logical argument can be. Achieved by making repeated reference to the research question and to the hypotheses derived from it an assessment of the extent to which the hypotheses are supported or the question is answered by the data or information accessed should form pat of the argument