The United States Geological Survey estimates that (as of 2005, the most recent year for which data is available) we withdraw 410 billion gallons of water a day, including both fresh and saline water. Most (80%) of these withdrawals go to thermoelectric power plants (for cooling) and agriculture (for watering crops).
Level 4 is the hair color level that is represented as dark brown. It is one of the most common natural hair colors and also very commonly found in hair dye. Level 4 is also common in red or...
The common factoid regarding hair colour says it is black. The most common hair color in the world is black, by a 2:1 ratio. In human examples, the simplest example for hair color involves several alleles; but the most common hair color in humans worldwide, black, is produced by the double-recessive. Common does not necessarily mean dominant!