Creatinine is a toxin produced during the metabolism of meat in our body. Therefore, people with lots of muscles or who eat lots of meat always have a relatively high creatinine level, but it usually fluctuates in the normal range: 0.5-1.3mg/dL.
comet definition An object that enters the inner solar system, typically in a very elongated orbit around the sun. Material is boiled off from the comet by the heat of the sun, so that a characteristic tail is formed.
Licensed from iStockPhoto. noun. The definition of a meteor is a small body of matter from outer space that comes into the atmosphere of the Earth and that looks like a streak of light due to iridescence caused by friction. A shooting star caused by a small object from outer space entering the earth's atmosphere is an example of a meteor.