Which are common issues for someone who has sickle cell anemia? Select two options. reduced oxygen levels
blurred vision
heart disease
blocked blood vessels
cancer

answer; i believe that the correct answer is (essential amino acids);

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there