How are fossil fuels formed from geologic processes? Fossil fuels are formed when mineral deposits are recrystallized due to high temperature and pressure over time.

Fossil fuels are formed when biomass is covered by sediment, and the biomass experiences high temperature and pressure over time.

Fossil fuels are formed when tectonic plates slide past one another, creating small

Fossil fuels are formed when tectonic plates collide together, forcing rock fragments deep underground.

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?