Please help! i will give brainliest to the first person, but you must have the CORRECT answer! Which of the following is an effect of organic matter on soil?
a.
improved soil structure
b.
decreased water retention
c.
increased nutrient loss
d.
all of the above

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?

2points what do bacteria have in common with the cells of other living organisms?

Which body region are part of the cephalic region?