Why is it important for your heart to keep oxygen rich blood seperate from oxygen poor blood?

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.

What are reasons people use tobacco

What are the five food groups recommended by the usdas my plate food guidance system