Healthy and balanced natural systems are essential for supporting life on this planet. ... Our respiratory organs, our vision, and our hearing are damaged because of the high amounts of contaminants in the air, water, and soil. A substantial number of people have conditions such as asthma, other respiratory problems or difficulties with additional organs of the body. ... They can affect the central nervous system, and other body systems, as well. ... Some birds experienced a decline in population, but also suffered serious hormonal and reproductive changes. ...

• Word Count: 2478
• Approx Pages: 10
• Grade Level: High School

They can invade and damage nearby tissues and organs. Cancer can also break away from a malignant tumor and enter the bloodstream and lymphatic system. ... It was discovered that when radioactive waves were directed on human cells, the cells would be destroyed. ... Mutations of the p53 gene are the most frequent abnormality identified in human tumors. ... She said she pictured the tumor as a large block of cheese and her immune system as a pack of mice. ...

• Word Count: 1594
• Approx Pages: 6
• Grade Level: High School