Ahistorian looks through hundreds of photographs from the terrorist attacks on new york city's world trade center on september 11,2001, try to learn more about the people it affected. which skills would the historian be using?

Aresearcher is studying women recently admitted to a state prison. all potential subjects must have children under the age of five. research subjects will be given a basket of toys to use at their children’s first visit that the children can then take home. in assessing this proposal, the irb needs to determine that the toys are: age appropriate.not an excessive incentive.educational.of high quality.