Drew currently walks two miles every day after school but wants to take his workout to the next level. which of these changes would you suggest he make to his routine to increase his stamina? walk before school instead of after ask a friend to walk with him take a short break between each mile alternate walking and running

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?