Difference between community, personal, physical and social activities to promote community and public health?

Is a short-term risk associated with tobacco use. a. lung cancer b. heart disease c. stroke d. coughing

Can you receive a shock severe enough to prevent you from releasing the wire from an ordinary outlet with dry hands?

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?