I would say Salt water is classified as a Mixture.
        
                    
             
        
        
        
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volcanic eruptions, earthquakes, and tsunamis
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This article discusses a group of scientists who are studying an ecosystem. What ecosystem are the scientists studying? A the Hudson River ecosystem.
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The photoreceptors would be your eyes, chemoreceptors skin, olfactory for nose and mechanoreceptors for obviously tongue hope this helps.