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Biology, 21.06.2019 22:30
Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.
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Biology, 22.06.2019 05:00
(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only
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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?
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A roller coaster uses the track in this picture. Where will the roller coaster have the most kinetic...
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