Answer: Every stable population has one or more factors that limit its growth. A limiting factor determines the carrying capacity for a species. A limiting factor can be any biotic or abiotic factor: nutrient, space, and water availability are examples. The size of a population is tied to its limiting factor.  The environment, what food is there and what predators live there. How much food they get and if they are decreasing from weather, predators etc.
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Answer: it stimulates the pancreas and the liver to produce secretions. 
There are a lot of hormone in making a good digestion and is responsible in the process to function properly. Secretin stimulate bicarbonate (base) from the liver and pancreas to promote normal growth and maintenance of the pancreas. It also counteracts the blood glucose that triggers the increase of insulin release and oral glucose intake. It also reduce the gastric juice secreted by the stomach along the digestion.
        
                    
             
        
        
        
A more clear understanding of the world around us. 
 
        
                    
             
        
        
        
Just like a compass, a modern day gps will say whether you're going north, east, south, or west, however they also tell your exact location and the location that you need to go too.