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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, 21.06.2019 22:10
What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?
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Biology, 22.06.2019 09:50
Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?
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Biology, 22.06.2019 10:50
The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million
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The kidneys respond to changes in osmolarity by...
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