Biology, 07.10.2019 05:20 hsjsjsjdjjd
Ageologist notices that a river is eroding its valley at a constant rate. knowing the height of the valley walls, how coul
geologist figure out when the river started carving the valley?
a.
sit and observe the river for a few hours until the valley walls double in height.
b. fill up the river valley with rocks, and time how long it takes the rocks to wash out
c. divide the height of the valley walls by the rate of erosion.
od. count growth rings of trees growing on the valley floor.
Answers: 3
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Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.
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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?
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As a result of these processes the single celled organism accomplishes
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Biology, 22.06.2019 14:30, mariap3504
The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping
Answers: 3
Ageologist notices that a river is eroding its valley at a constant rate. knowing the height of the...
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