The purpose of cerebrospinal fluid is which of the following?
A. To absorb excess electrical activity and maintain homeopathy.
B. To provide shock absorption and help maintain homeostasis.
C. To help maintain homeostasis and absorb unused brain tissue.
D. To absorb shocks and provide moisture for the nasal cavities.
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What is the objective ethical ideal

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?