Which of the following statements is true concerning classification systems for mental disorders? a. it is far more important that they be reliable than it is for them to be valid. b.classification systems make it more difficult to gather statistics on the incidence and prevalenceof disorders. c.classification systems meet the needs of medical insurance companies who need diagnoses in order to authorize payment of claims. d.although they assist scientists who are researching disorders, they always inhibit our ability to communicate about abnormal behavior in a consistent way

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.