Which of the following is a true statement about the rock cycle? a
Sedimentary rock can revert to metamorphic rock but never to igneous rock
b
Weathering occurs in igneous rocks but never in sedimentary or metamorphic rocks
c
Heat, pressure, cooling, weathering, erosion and deposition change rock
d
The formation of rock within the rock cycle ends after metamorphic rocks form

Arepair man charged $93.06 the price included 2 hours of labor and 40 service charge how much does the repairmen charge per hour for labor?

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.

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?