Infants as young as 6 months can distinguish between arrays of 8 versus 16 dots but not between 8 versus 12 dots, indicating the use of which of these core knowledge systems?

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?