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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 22:00
Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses
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Biology, 22.06.2019 04:20
Hybrid instruments that play sounds that are part sampled and part synthesized are known as:
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Biology, 22.06.2019 05:50
Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?
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41. The two kingdom system was introduced by Aristotle in 4 century
time ago...). He classified an...
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