What kind of epidemiological study is the following example? "A study that evaluates two treatments for ovarian cancer. Women with stage 1 ovarian cancer are randomized to receive either oophorectomy alone or oophorectomy with radiation. Women are followed for 5 years to determine if there are any differences in ovarian cancer recurrence and survival."

Clara wrote the following hypothesis for an experiment about acidophilic bacteria. bacteria cells will stop dividing in a basic (alkaline) environment because of the high ph. which statement is the best way to restate the hypothesis so that it is more specific? growing acidophilic bacteria in some environments will cause the cells to stop dividing because of ph. if the ph of their environment is changed, acidophilic bacterial cell division will be affected. if the environment of acidophilic bacterial cells becomes alkaline, the bacteria will stop dividing. the more alkaline an environment, the less cell division will occur in bacteria.