Ans.
Sickle-cell disorder is a genetic disorder, which shows defected red blood cells, due to mutation in the genes for hemoglobin protein.
Malaria is common in sub-Saharan Africa region and there, natural selection favored gene for sickle cells, because it might be beneficial to people having sickle cell disease that makes them able to survive in such condition and transmit their genes to offspring.
On the other hand, in those Africans, who moved to United States, where malaria is uncommon or absent, natural selection favored normal, wild type genes, resulting in fewer people with defected sickle cell.
Hence, sub-Saharan African population shows higher percentage of mutated gene for sickle cell as compared to population of United States.
Thus, the evolutionary process behind this difference is 'natural selection.'
Answer:
embryophytes
Explanation:
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<span> There will be fewer natural resources available for future generations.
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B is better because it has more surface area.
The right answer for the question that is being asked and shown above is that: "<span>A. they will overcome the deficiency of nitrogen in the soil." T</span>hese legumes enrich the soil is that <span>they will overcome the deficiency of nitrogen in the soil. </span>
