Biology, 12.11.2019 22:31 lizbethh62
The respiratory system allows for gas exchange to happen in the lungs. how does the respiratory system affect the cardiovascular system?
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Which plant has a visible leaf modification that will it conserve water in extremely dry environments?
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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, 22.06.2019 06:30
What is the problem in this article? what solution does the article propose?
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The respiratory system allows for gas exchange to happen in the lungs. how does the respiratory syst...
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