A variety of small animals and insects can live in a mountain tundra ecosystem. The ground in such places is often rocky with very little soil. The plants that grow there are fragile and grow slowly. What would most likely happen in the ecosystem if many people carelessly trampled the tundra and killed off the plants?
A.
The number of rocks in the tundra would increase.
B.
The amount of soil in the tundra would increase.
C.
The populations of many animal species would decrease.
D.
The new plants would grow more quickly.

What abo controlling alleles could kim give her child

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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?