Which of these energy sources is most closely related to the harvesting of a corn crop?

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.

What type of genetic drift would be simulated if all the beans that were not selected died out?

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels