3. In the process of _(Glycolysis), a six-carbon molecule of glucose is broken down into two three-carbon molecules of pyruvate, with a net yield of _(2). (H) ATP. Within a mitochondrion,
these molecules of pyruvate enter a cyclic set of reactions called the
Cycle,” which yield
(#) more ATP. The third and final step in the aerobic production
of ATP is the
Chain, where
(#) more ATP
are produced.

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?