Adeficiency in can cause a disease that may result in poor wound healing, bleeding gums, loss of teeth, severe
pain, and even death due to the poor formation of collagen.
select one:
a. vitamin d
b. folic acid
c. vitamin c
d. niacin

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?