Use the drop-down menus to complete each sentence about the layers of the atmosphere. If the
did not exist, Earth might be destroyed by chunks of rock from space.

The
is located 12 to 50 kilometers from Earth’s surface.

Both the
get colder as altitude increases.

The ozone in the
protects people from ultraviolet (UV) radiation.

The
has the highest temperature of any layer in Earth’s atmosphere.

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 class of levers is shown in this image?

Which topic is most likely to be studied by bo which topic is most likely to be studied by botanist? insect metamorphosis, viral infection, plant growth, animal physiology