What does perpendicular mean in earth science

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 is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Asap what occurs after cytokinesis is completed at the end of meiosis 1?