Ｓｅｅ ｍｏｒｅ ｎｕ!ｄｅ ｐｈｏｔｏｓ ｗｉｔｈ ｍｅ

Ｆｉ!ｎｄ ｉｔ ｈｅｒｅ ｂａ!ｂｅ:
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Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

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.

Would really appreciate it, i have an idea but not completely sure