How do the cells of a multicellular organism differ from those of a unicellular organism? A.) They never replicate.
B.)They are specialized.
C.)They perform all functions.
D.)They are all the same.

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?

Which of these is not an obstical to the future of space exploration? fundingresearch ideas technologytime

Why do the circulatory systems of land vertebrates have separate circuits to the lungs and to the rest of the body?