Biology ?

seeds are contained in a closed container with some sodium hydroxide pellets. due to these pellets all carbon dioxide gas is absorbed out of the air. how do you expect the pressure of gas to change in the container over time?

a. pressure increases as oxygen is produced.
b. pressure decreases as oxygen is used up.
c. pressure stays the same as oxygen is used up and carbon dioxide is produced.
d. there is no pressure in sealed containers.

in advance: )

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?