Answer: 
Ozone
Explanation:
Ozone is considered a pollutant in the troposphere, but in the stratosphere it is essential to life on earth because it absorbs biologically harmful UV radiation. The mesosphere and the thermosphere are two additional atmospheric layers above the stratosphere.
 
        
             
        
        
        
<span>Akathisia is the inability to sit still. People will tend to be uneasy and want to be doing something. They'll be fidgety, looking for something to do with their hands, or be looking to get up and walk around.</span>
        
             
        
        
        
Answer: 
The variable that does not rely on another variable. IVs can include time, weather, etc.
Explanation:
 
        
             
        
        
        
I think that the answer should be A or in other words, it would be liquid.