1 Allergic reactions and sensitivities to certain foods may cause a canker sore to develop. Allergic reaction to certain types of bacteria found in the mouth may also result in this type of mouth ulcer.  Celiac disease sufferers may experience canker sores.
One of the biggest sources is called nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution includes many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, livestock ranches, and timber harvest areas.ne of the biggest sources is called nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution includes many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, livestock ranches, and timber harvest areas.
1. The primary source of energy for the earth's atmosphere is: a. energy from within the earth . b. the sun . c. erupting volcanoes . d. lightning discharges associated with thunderstorms . e. latent heat released during the formation of hurricanes . ANSWER: b . 2. The most abundant gases in the earth's atmosphere by volume are: a. carbon dioxide and nitrogen