Will mark brainliest Scientists were investigating a pond of water found deep in a South American cave
along the Yucatan Penisula. The obtained many samples which they took back to their
lab. After much testing, they found that the water has an acidic pH of 3. Another much
more surprising discovery was that a new species of unicellular organism was present in the samples. The organism was observed with a microscope and found to not have a bound nucleus or organelles. To which Domain would this organism be classified?

a. Archaea
b. Bacteria
c. Eukarya
d. Protista

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?