Julio knows that sickle cell disease is a serious genetic disorder. He learns that in the United States, approximately 1 in 12 people of African ancestry carries the sickle cell allele. He asks, "Why is the sickle cell allele present in such a high frequency?" Which statement would be MOST USEFUL to include in an answer to Julio's question?

A. The sickle cell allele causes a significant change to a blood protein.
B. The sickle cell allele formed from a point mutation.
C. Two copies of the sickle cell allele are necessary to express the disorder.
D. Having one copy of the sickle cell allele provides resistance to malaria.

the answer is c most of the fortnite players usually buy v bucks to get the battle pass and other cosmetics but some players who are referred to as "no skins" don't   buy skins and are usually noobs.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

carbon atoms, hydrogen, oxygen, and nitrogen.