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Retrospective studies show that HIV was present in humans as early as a.) 1981 b.)1970's c.)1959 d.)1937
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Retrospective studies show that HIV was present in humans as early as

a.) 1981
b.)1970's
c.)1959
d.)1937

User Grill
by
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1 Answer

5 votes
1959 ..................
User Ahmad Arslan
by
7.9k points
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