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During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

What are the five stages of physical activity behavior

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?