Immunodeficiency occurs when the immune system is not working properly, and iron deficiency causes anemia and it weakens the immune system. Given these facts, what can low iron cause among the following options:
- contamination
 - Pollution
 - decrease stamina
 - harmful substances
 - immunodeficiency
 - the ground shaking
 - cloudy and rainy weather
 - Temperature changing


 

     immunodeficiency    