Body composition is best described as
a. the amount of lean muscle in a body
b. the total amount of muscle in a body
c. the total mass of fat in the abdomen
d. the ratio of fat to other tissue in a body select the best answer from the choices provided. a b c d

How do the nuclei of covalently bonded atoms keep the bond together

Name the organs of humanelemintary canal.

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?