What is the purpose of the valves in the heart? O To keep the blood flowing in only one direction
To prevent pathogens from entering the heart
To separate the heart into two sides
To control how fast the heart beats

Explain why you believe physician assisted suicide should or should not be legalized in more states across the us.

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?

First to answer will be the brainliest i need the answer asap