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Biology, 27.06.2019 14:00 babygreg2001p97abr
If north is straight up on a 2-dimensional graph, where would a coordinate point east and south of the reference point be located? a. upwards to the left b. upwards to the right c. downwards to the left d. downwards to the right
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Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?
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