The Ogallala Aquifer is the largest aquifer in the United States.
It occupies an area of 174,000 square miles, spreading across 8 Great Plains States.
 
        
                    
             
        
        
        
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Natural selection can only occur because of a variety in a population. Natural selection refers to environmental factors that affect a population and causes some of the population to have more surviving offspring than others. An example is a giraffe with a longer neck will be more likely to survive and reproduce (as it can gather more food from taller trees)
        
             
        
        
        
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Temperature and pressure progressively increase with increased proximity to Earth's core. Recent studies indicate the core's temperature may be close to 11,000 degrees Fahrenheit; that's nearly 2,000 degrees warmer than previously thought and hotter than the surface of the Sun, according to a 2013 Forbes article.
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Hormones, Cell receptor and glands