There are 500 sheets of printing paper in a pack. Juan notes that the thickness of 500 sheets is 1.3 inches. The thickness, in inches, of a single sheet is given by the expression

A)1.3 divided by 500
B)1.3+500
C)500x1.3
D)500divided by 1.3

Differentiate renewable and nonrenewable resources

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?

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates