Acomputer model can simulate the aspects of viral reproduction quite well; however, microscope observation of actual viral reproduction can improve understanding because actual
a.) may reveal greater unknown complexities.
b.) are easier than a computer model to view.
c.) are the same each time.
d.) may provide reproduction events in sequence.

the answer to your question is:

c. complementary base-pairing

voluntary muscles are controlled by the cerebellum.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.