Skeletons are important in human and birds to an animal

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 causes the phospholipids to organize themselves the way they do

What is the inability of an individual or a society to achieve a minimum standard of living known as ?