Which organism can mostl likely be classified in the domain bateria?
a.) a predatory organism that depends on hunting plant-eaters for food
b.) a multicellular organism that reproduces via spores and gets its food from a dead log.
c.) a photosynthetic organism that undergoes sexual reproduction and produces seeds in cones.
d.) a unicellular organism that has a simple structure and is commonly found in human intestines.

Which experiment would most likely contain experimental bias ?

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review

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?