Question

1. what two diseases have been studied together that provide evidence of evolution in humans?

malaria and ebola
sickle cell anemia and malaria
iron - deficient anemia and yellow fever
cytochrome c disease and plasmodium fever

Explanation:

Sickle cell anemia and malaria are studied together for evidence of human evolution. Individuals with the sickle cell trait (heterozygous for sickle cell anemia) have a survival advantage in malaria - endemic regions. This is because the sickle - shaped red blood cells make it harder for the malaria parasite (Plasmodium) to infect the cells. Over time, in areas with high malaria prevalence, the frequency of the sickle cell allele has increased due to natural selection, showing how evolution can act on human populations in response to disease. Malaria and ebola have no such evolutionary link related to human evolution in this context. Iron - deficient anemia and yellow fever also do not have this specific evolutionary relationship. Cytochrome c is a protein involved in cellular respiration and there is no "cytochrome c disease" or "plasmodium fever" (malaria is caused by Plasmodium) with the relevant evolutionary connection.

Answer:

B. sickle cell anemia and malaria