Secondary succession occurs ____
a. after a fire
b. on a new volcanic island
c. on bare rock
d. on land exposed as a glacier retreats
e. in the area between high tide and low tide
ANSWER: a
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Early in the infection with HIV, most virions bind to the host cell using CCR5 as a coreceptor. As the infection progresses, the HIV population evolves to use an alternate coreceptor. What is the alternate coreceptor these X4 viruses utilize?
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The male gametophyte is also called an embryo sac
____________________ Indicate whether the statement is true or false.
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