Question

this condition is characterized by a decrease in the number of red blood cells and/or their oxygen - carrying capacity. polycythemia leukemia anemia thrombocytosis

Explanation:

Anemia is defined as a decrease in the number of red blood cells or their oxygen - carrying capacity. Polycythemia is an increase in red blood cells. Leukemia is a cancer of blood - forming tissues. Thrombocytosis is an increase in platelets.

Answer:

Anemia