prove mathematically that hexagonal system of layout accomodates approximately 16% more than square system of layout.​

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.

List five ways we are indebted to phytoplankton

Me.henley said, “in the rat race we call life, only the strong will survive.” he may have been referring to