Why does the fact that the red cells have different proteins to the white cells alter the function of the cell ?

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.

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

All phases of matter may have a fixed mass