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Biology, 21.06.2019 18:30
The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.
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Biology, 23.06.2019 01:50
This movement of birds is called .the change in the pattern of movement of birds suggests
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Mathematics, 15.11.2019 11:31
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Social Studies, 15.11.2019 11:31
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Mathematics, 15.11.2019 11:31
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