Since the implementation of the Clean Air Act, the concentrations of all major air pollutants have decreased.

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.

If you were running a marathon, which type of muscle fibers would be most useful to you? a. slow-twitch b. fast-twitch, type i a c. intermediate-twitch, type ii b d. slow-intermediate twitch, type i b select the best answer from the choices provided. a b c d

What if you were not responsible for planning the menu, and you noticed that the portions provided were often very large? what resource(s) could you use to understand the appropriate portion sizes for children? a. national and state health standards b. cooking course c. ask parents d. ask the school nurse and guidance counselor