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 />
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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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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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