Increased physical activity can improve your mood, which can in turn
determine your career choice
distract from your schoolwork
you have fun with friends
make you lose your job

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?