What is the mean (average) of 101.9, 90.9, and 89.3?

Amolecule of one atom of carbon and two atoms of oxygen would be written oco? осо, o co2 o 200

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.

The cluster of developing cells from conception until birth is called an