1.circle the letter of the protein that is not normal in people with sickle-cell disease
a. mucus b. hemoglobin c. red blood cells d. clotting protein

Often, caries will develop in an area of the tooth that's not readily accessible. which cavity preparation form defines this? a. retention b. resistance c. outline d. convenience

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.

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy