Cardiovascular endurance which is one of the physical fitness component is the ability to

a) exert force against a resistance.

b) the deliverance of oxygen rich blood to muscles by the heart, lungs and vascular system.

c) the ability to generate force between two objects.

d) the ability to create a more muscle mass.

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?