Is sickle cell anemia demonstrated

yes

Explanation:

Doctors diagnose sickle cell through a blood test that checks for hemoglobin S - the defective form of hemoglobin. To confirm the diagnosis, a sample of blood is examined under a microscope to check for large numbers of sickled red blood cells - the hallmark trait of the disease.

answer; ewing's sarcoma;

answer; rational if melanie values sleep more highly than the benefits she expects to receive from attending the class;