Arizona has more than one desert.
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The mouth is the beginning of the digestive tract. In fact,digestion starts here as soon as you take the first bite of a meal. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.
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Well considering the lack of information given, most logically we can conclude it’s the peripheral nervous system.