Some one me on this one short short question markbr />

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.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Which organ controls breathing? lungs alveoli heart diaphragm