Which of the following best describes the function of nerves?
a. they send information around to different cells of the body.
b. they connect the brain to the body.
c. they carry messages from the muscles.
d. they carry sensory and motor impulses.

Iwanna go do something with my ideas? ?

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 is it called when lava when it erupts from the surface through volcanoes.