Which scenario most likely requires attention from a mental health professional? 1: Ian feels sad for a few days after a significant event. 2:Lucy feels anxious before a big test and has difficulty sleeping. 3:David feels sad for a long period, even when something good happens. 4:Olivia feels angry at and refuses to speak to a friend who betrayed her.

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.