The natural world, or the environment, can be organized into different levels. Analyze each of the descriptions below, and select the one that correctly describes the community level of organization: several different species living in the same area includes one living species and their interactions within an ecosystem a group of organisms of the same species, in the same place, at the same time one organism

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?