Geologists found a mountain range in Australia and a mountain range in South America that have similar rock distribution. They also think the mountain ranges have weathered at the same rate. In the Australian mountains, they find a large number of Perisphihinctes tiziani fossils. In the South American mountains, they find a layer of Pecten gibbous fossils. Using this chart, which of the following statements is correct? The mountain ranges were formed around the same time

Australia and South America must have been connected in Earth's history

The mountains in Australia are older than the mountains in South America

The mountains in South America are older than the mountains in Australia

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?