Unlike minerals such as iron and calcium, protein is a macronutrient in the human diet. Why is protein a macronutrient? A. The human diet should be made up of mostly protein. B. Proteins are the most calorie-dense molecules that humans eat. C. Proteins are one of the few inorganic compounds that humans eat. D. The human diet requires a relatively large amount of protein.

Which of the following birds remained ancient looking in the miocene epoch? a. crows b. owls c. grouses d. none of the above

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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