Why would an iron deficiency cause anemia?

leukocytes require iron to produce antibodies
hemoglobin requires iron
oxygen attaches to iron dissolved in the blood
iron produces red blood cells in the bones

Iron deficiency anemia occurs when your body doesn't have enough iron to produce hemoglobin. Hemoglobin is the part of red blood cells that gives blood its red color and enables the red blood cells to carry oxygenated blood throughout your body. Causes of iron deficiency anemia include: Blood loss.

1.fossils 2.analogous organs 3.homologous organs