Portion of mutated hemogoblin dna

Sickle cell anemia is a genetic disease with severe symptoms, including pain and anemia. The disease is caused by a mutated version of the gene that helps make hemoglobin — a protein that carries oxygen in red blood cells.

answer; ///i believe that the correct answer is (e); check first good

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."