Cells formed by meiosis are Select one:
A. used in growth and repair of tissues
0 B. sex cells (gametes)
C. are always diploid
D. contain only small amounts of cytoplasm

How water is moving through the ecosystem ?

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?

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.