A change in their food, from trees to grass in the Great Plains.
 
        
                    
             
        
        
        
It helps the concept of decentralization because its the same anywhere , and it if it happened assist centralization then it would taste the bet in one place and it would taste different/bad everywhete else <span />
        
             
        
        
        
Answer:
Scientific models are used to explain and predict the behaviour of real objects or systems and are used in a variety of scientific disciplines, ranging from physics and chemistry to ecology and the Earth sciences.
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hope this helps!! vote me brailyest plzzz and have a great day!! :D
 
        
             
        
        
        
Answer:
individual organisms of the same species living in the same geographic location at the same time makes up a population. 
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