Confederate batteries fired on fort sumter when it was learned that

Identify the example of when situation and time are key to assessing risk of harm in a research study: a study on the efficacy of a behavioral intervention for smoking cessation involves both adults and teenagersasking women if they have had an abortionresearch on the prevalence of hiv-infected individuals in communitiesa survey about sexually transmitted diseases

How much time on average do americans currently spend watching tv and videos per day?

17 points! ! (explain your answer)