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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 01:30
You are shown 2 samples of the earthes crust . the first is denser than the second . which most likley is oceanic crust
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Biology, 23.06.2019 02:30
Amalignant tumor is different from a benign tumor in that a malignant tumor is
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3. Water is used in the cells to help transport the chemicals necessary to survive. Since cell membr...
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