8. Several organisms live in a pond polluted with pesticide. The pond contains algae. small water animals that eat algae, fish that eat small water animals, and birds that eat fish. The
highest concentration of pesticide
would be found in the
a. small water animals.
B. birds.
c. algae.
d. fish.

What correctly describes the relationship between the earth and the sun

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

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?