Compare and contrast geological tilt and fold 10 points.

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.

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Select the word from the list that best fits the definition a system made of 25 satellites