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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.
Answers: 2
Biology, 22.06.2019 12:30
Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled
Answers: 1
Biology, 22.06.2019 13:50
The fluid mosaic model of the membrane proposed that membranes
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Biology, 22.06.2019 15:30
Make a claim about the factors that cause inherited genetic variations within populations. also make a claim about the effects of mutations.
Answers: 3
Is oxygen a requirement of all living things?...
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