<span>Russell's case (two illnesses: bipolar disorder and substance use disorder) illustrates </span>comorbidity. The term comorbity is used in medicine to denote a presence of two diseases or disorders, one primary and one additional, both occurring at the same person.
Science is based on the feature of "<span>detailed research with reliable sources" among many other things. It is crucial that the tests can be repeated with the same results. </span>
By increasing green house gases in the air like Carbon Dioxide, Methane, and Nitrous oxide.
Because we can’t tunnel down, so in order to study the interior layers, we must use indirect methods.
