___ is the membrane bound structure that uses the mechanical energy created by the passive movement of hydrogen ions from an area of high concentration to an area of low concentration to drive the synthesis of ATP. (two word, singular)

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.

In the practice of science, this type of reasoning is used to develop explanations.

What drives the atp synthase reactions that produce atp