Which best describes the role of nitrogen in the human body? O A. Main ingredient of protein
B. Transfers energy in cells
C. Makes energy in cells
O D. Makes up 1.5% of the human body

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 are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

Gene expression is the activation of a gent that results in a question 1 options: protein dna mitochondria