![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Biology
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 13:00
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?
Answers: 1
![question](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 13:10
Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.
Answers: 1
You know the right answer?
How did Thomas Malthus help Darwin in his theory?...
Questions
![question](/tpl/images/cats/en.png)
English, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30
![question](/tpl/images/cats/mat.png)
Mathematics, 02.03.2021 06:30