Approximately, african americans is a carrier for sickle-cell anemia

The sickle cell anemia is genetic disorder, in which the red blood cell becomes sickle shaped instead of its biconcave shape. This condition is a autosomal recessive disorder.

The carriers are the people, who are unaffected by the disorder, but carry one recessive allele, which can cause the disease in next generation. They are hetrozygous for the trait.

It is estimated that 1 out of every 10 or 10% African American are the carriers of the Sickle cell anemia.

So, the correct answer is Approximately, 10% African Americans is a carrier for sickle-cell anemia.

eukarya because is is like alche and b is bacteria and d is animals

explanation:

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this