For the following organisms, choose the correct order of increasing trophic level.
a. fungi, deer, wolf and grass
b. fungi, grass, wolf and deer
c. grass, deer, wolf and fungi
d. grass, fungi, wolf and deer

Which taxon group is more specific, in regards to organisms that are in that group? mammalia animalia

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

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?