Zachary’s friends have all started wearing an expensive brand of shoes and are now insisting that he buys the same shoes. which best describes this situation? empathy reciprocity positive peer pressure negative peer pressure

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?