The early symptoms of HIV infection resemble the flu in about 70 of infected individuals (there are no noticeable symptoms in the remaining 30). These symptoms occur because the HIV present in the bloodstream is destroying large numbers of T4 cells, thus interfering with normal immune responses. Most people infected with HIV begin to control the virus within six to 12 weeks, and therefore recover from these flu-like symptoms. This seeming recovery from the infection is due to the actions of the immune system.
The purpose of the paragraph is
a. to inform the reader how the HIV infection can resemble the flu in the early stages and affects the immune system.
b. to instruct the reader not to mistake flu-like symptoms for HIV infection.
c. to caution those who have flu-like symptoms of the possibility of HIV infection.
The tone of the paragraph is
a. instructive and gloomy.
b. cautious and sad.
c. informative and straightforward.
Question 2
Generally, reading should be a __________________p rocess.
a. vocal and mental
b. visual and mental
c. visual, vocal, and mental
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What is the frequency of individuals that are homozygous for this allele?
Early Earth