Sedimentary rock indicates the current or past existence of
water
lava
plants and animals
carbon dioxide


choose all the answers that apply.

the crust is:
the thinnest layer
made of large pieces called plates
mostly made of silicon dioxide
the outermost layer of the earth
also called the hydrosphere


the ozone layer
is part of the troposphere
is used to send radio signals
protects the earth from uv radiation
is made of charged ions and free electrons

Plants that have reproductive structures called cones are?

Which is the most likely reason the writer of the play pygmalion chose to change the character of galatea from a statue to working-class woman?

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?