1. When a scientist announces a finding or proposes a new idea, other scientists may . 2. The main features of the scientific method are .

3. The scientific method begins when .

4. A good hypothesis will .

5. A hypothesis can never be completely proved. At any time, however, a hypothesis may be disproved by .

6. In an experiment, the scientist sets up .

7. A controlled experiment involves two experimental setups in which .

8. The results of an original investigation cannot be considered valid unless the investigation can be .