Which of the following statements is true? genetic drift favors organisms which are well-adapted to the environment. if a species is well-adapted the environment, they cannot become extinct. the introduction of an invasive species can protect endangered organisms. species with low genetic diversity are at a higher risk for extinction than species with high genetic diversity.

Amines amides and amino acids are categories of

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?

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?