... alone every year. The news constantly contains reports of the many different types of ways a human can get cancer. The main reasons one can get cancer are smoking, dietary factors, exercise, occupation, genetics, pollution, radiation, and even prescription drugs. Out of all the main causes ... of cancer obesity and smoking are the leading causes. Cancer affects a person when abnormal cells within a tissue of a certain part of the human body continue to divide out of control. Normal cells stop reproducing after about fifty cycles. Since many types ... and cancer causing. Many more rumors...

• Word Count: 831
• Approx Pages: 3
• Grade Level: High School

... were light brown speckled with green. There were always a few dark-colored moths around, but light colored moths were the most common. Then, the Industrial Revolution began in England and pollution stained the tree trunks dark brown. At the same time, biologists noticed that more dark-colored moths were appearing. The evolutionary hypothesis suggested that birds were the main reason. Birds ... enough, and more experiments had to be made. A British ecologist, called Kettlewell, prepared another test for this hypothesis. He placed equal numbers of light and dark colored moths in two types...

• Word Count: 1784
• Approx Pages: 7
• Grade Level: High School

... were light brown speckled with green. There were always a few dark-colored moths around, but light colored moths were the most common. Then, the Industrial Revolution began in England and pollution stained the tree trunks dark brown. At the same time, biologists noticed that dark-colored moths were appearing. The evolutionary hypothesis suggested that birds were the main reason. Birds are ... enough, and more experiments had to be made. A British ecologist, called Kettlewell, prepared another test for this hypothesis. He placed equal numbers of light and dark colored moths in two types ...

• Word Count: 2685
• Approx Pages: 11
• Has Bibliography
• Grade Level: High School