21. Students in Mr. Clark's science class were trying to explain why we see the different phases of the moon. Which student's explanation is correct?
A. Student A explained that we see the different phases because the moon revolves around the earth.
B. Student C explained that we see the different phases because the moon revolves around the sun.
C. Student B explained that we see the different phases because the moon is very large. D. Student D explained that we see the different phases because the moon is covered with many craters.

bc blah

explanation:

bc blah

thinking it would be d not too sure but i think it's right

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

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