Heather understands the importance of safety when riding her bicycle. Her little sister is learning to ride her two-wheeler as well. How can Heather assist her younger sibling and insure a safe ride for them both? O Check to make sure her sister's helmet fits correctly O Do a pre-ride inspection of both bikes O Review how to cross intersections and the rules of the road with her sister O All of the above

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.