What is one cause of speciation a. populations are morphologically separated b. populations become infertile c. populations interbreed d. populations become reproductively isolated

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.

Dna is colied into chromosomes in a cell

Which organism can most likely be classifild as domain bateria