Bob has a beaker filled with an unknown liquid and must determine what it is. He decides to systematically use a number of tests to determine the correct answer. According to Piaget, Bob has most likely reached the stage of cognitive development.

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.