What is formed when atoms of elements combine? compounds electrons protons neutrons

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.

Which units ate used to measure both velocity and speed? check all that apply

What are the responsibilities of the region of the brain highlighted below? =+= will rate brainiest =+=