Answer: neutral
Explanation: The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
 
        
                    
             
        
        
        
Cell-tissue-organ-organ system-organism
        
                    
             
        
        
        
Answer:  structural, physiological and behavioral adaptations. Most organisms have combinations of all these types.
Explanation:
 
        
             
        
        
        
Answer:
Air pressure drops, and temperatures get colder.
Explanation:
Hope this helps!!