In a population with brown and green alleles for color, genetic drift. a. has more effect on the evolution of a small population. b. always increases the frequency of brown alleles in the population. c. has more effect on the evolution of a large population. d. causes populations to become better adapted to their environments. d. occurs when individuals move into or out of a population, changing the allele frequencies in the population.

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?

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d

Communication and transportation have improved as a result of scientific advancements. select the best answer from the choices provided of mark this and return save and exit next