A(n) scan uses radioactive markers in the blood to monitor blood flow and metabolic activity via x-ray

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors. b) transcription from the host cell rna polymerase introduces numerous mutations. c) capsid proteins from the host cell can replace the viral capsid. d) viral rna is translated by host cell ribosomes.

Second hand smoke can be almost as harmful as smoking. true or false?

Why is mental-emotional health important? check all that apply. encourages others one feel better improves physical fitness fosters better relationships one do better in school enables one to enjoy free time