comes from the earth's crust<span />
This is known as the pericardium
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.
Answer;
Acid rain is non-point source and it results in the decrease of pH of soil, water and damage to crops and buildings
Explanation;
Acid rain has many effects in the ecosystem, with a much greater impact on lakes, streams, wetlands, and other aquatic environments
Acid rain makes waters acidic, and causes them to absorb the aluminum that makes its way from soil into lakes and streams;
As the acid rain flows through the soil, the acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes.