Answer:
Carbon is the most important element to living things because it can form many different kinds of bonds and form essential compounds.
Believe this ITS CARBON NOT OXYGENNNNN
Sickle cell disease is a hereditary disease seen most often among people of African ancestry. Caused by mutations in one of the genes that encode the hemoglobin protein, the disease is inherited as an autosomal recessive trait.
I think it would be A. Helicase