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...
Although hair color is dependant on dominant and recessive qualities, predicting hair color is more complex than predicting other genetic traits. Rather than one or the other, hair color is additive, meaning the pigment melanin along with a variety of genes determines how dark your hair will be.