According to the World Wildlife Fund, if deforestation, or the clearing of trees, continues as it has been, 55 percent of the Amazon rain forest could be gone by 2030.Following are examples of Amazon rain forest animals that have already been affected by deforestation.(Mario Tama/Getty Images News/Getty Images).ccording to the World Wildlife Fund, if deforestation, or the clearing of trees, continues as it has been, 55 percent of the Amazon rain forest could be gone by 2030.
The three major causes of iron deficiency are: 1  Chronic or excessive bleeding. Long-term (chronic) bleeding is the most common cause of iron loss that leads to iron deficiency. 2  Decreased ability to absorb iron. Medicines that reduce stomach acids may cause iron absorption problems. 3  Insufficient iron intake.
Mild anemia often causes no symptoms. More severe anemia can cause fatigue, pale skin, and shortness of breath with exertion. Iron-deficiency anemia: Iron is necessary for the body to make red blood cells. Low iron intake and loss of blood due to menstruation are the most common causes of iron-deficiency anemia. It may also be caused by blood loss from the GI tract because of ulcers or cancer. Treatment includes iron pills, or rarely, blood transfusion.