The image shows the skulls of three different organisms. the foramen magnum position is the hole in the skull where the spinal nerve cord passes through. based on the structure of the skulls, which two statements can you infer? all three organisms share a common evolutionary lineage. wolves do not share any common ancestors with humans and chimpanzees. humans likely share more common ancestors with chimpanzees than they do with wolves. chimpanzees share more ancestors in common with wolves than they do with humans.

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?