What causes sickel cell anemia

Sickle cell anemia is caused by a mutation in the gene that tells your body to make the iron-rich compound that makes blood red and enables red blood cells to carry oxygen from your lungs throughout your body (hemoglobin)

Explanation:

Sickle cell anemia is caused by a mutation in the gene that tells your body to make the iron-rich compound that makes blood red and enables red blood cells to carry oxygen from your lungs throughout your body

Explanation:

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

c should be the answer