What does this question mean
        
                    
             
        
        
        
I would say D, because you need to start with nothing to measure the different sizes as they start to grow. hope this helps!
        
             
        
        
        
Answer:C
Explanation:
Mountain Dew soda is not a colloid 
 
        
             
        
        
        
The air molecules in the compressions of the second wave are denser, so the sound is louder.
<h3>What is a sound wave?</h3>
Sound waves are longitudinal waves that travel through a medium like air or water.
In a closed room, Noah and Nina are sitting 15 m apart.
As Noah says the same sentence twice, Nina does not hear the sound the first time but she does hear the sentence the second time.
This happens as the air molecules in the compressions of the second wave are denser. As a result, the sound is louder.
The correct option is ''The air molecules in the compressions of the second wave are denser, so the sound is louder''.
Learn more about the sound wave here:
brainly.com/question/1554319
#SPJ1
 
        
             
        
        
        
Physical because you can see it evaporate have a great día