What did Lashley develop by purposely damaging the brains of rats that had learned a task and then testing those rats to see if the brain damage impaired their ability to
complete that same task?
Select one:
O a. Stroop effect
O b. Equipotentiality hypothesis
O c. Chunking effect
O d. Levels of processing hypothesis

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?