How does exercise influence stress? 1. increases feeling ms of tiredness, thereby reducing stress. 2. increases cortisol levels, thereby reducing stress 3. reduces cortisol levels, thereby reducing stress 4. does not influence stress 5. increases adrenaline levels, thereby reducing stress

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.