Misshapen red blood cells that tend to clump together causing obstructions in blood vessels are a sign of:
A) iron-deficiency anemia
B) aplastic anemia
C) pernicious anemia
D) sickle cell anemia
D
Explanation: The other forms of anemia are aplastic anemia, in which the red bone marrow fails to produce sufficient numbers of normal blood cells; iron-deficiency anemia, caused by a lack of available iron, resulting in the body's inability to make adequate amounts of hemoglobin; and pernicious anemia, caused by an inadequate supply of vitamin B12 usually obtained from a healthy diet.
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